What are the different classification methods of shoes?

What are the different ways to classify shoes?

There are many ways to classify shoes. ①. According to the wearing objects, there are shoes for men, women, children, and the elderly. ②. According to the season, there are single, jacket, cotton, sandal and other shoes. ③. According to materials, there are leather shoes, cloth shoes, rubber shoes, and plastic shoes. ④. According to the process, there are sewing, injection molding, rubber injection, molding, vulcanization, cold bonding, seam bonding, slush molding, assembly, foaming and other shoes. ⑤ According to the style, the head type includes square toe, square round head, round toe, pointed round toe, and pointed toe; the heel type includes flat heel, semi-high heel, high heel, and wedge heel; the upper type includes high high heel, low low heel, and medium heel. Tong, Gaotong. ⑥. According to the purpose, there are daily life shoes, labor protection shoes, sports shoes, travel shoes, negative heel shoes, etc. ⑦. According to physical properties, they are divided into: insulating shoes, anti-static shoes, and conductive shoes. ⑧. According to structure, they are divided into: breathable shoes with holes, solid shoes, warm shoes, etc. 1. Try to discuss the different classification methods and corresponding types of piles.

The pile foundation in engineering is often composed of several piles. A cap is set on the top of the pile to connect the piles into a whole and evenly transfer the load of the superstructure to the piles.

1. Score according to the height of the cap position

① High cap pile foundation - the bottom surface of the cap is higher than the ground, and its stress and deformation are different from the low cap pile foundation. Generally used in bridge and dock projects.

② Low cap pile foundation - the bottom of the cap is lower than the ground, generally used in housing construction projects.

2. According to different load-bearing properties

①End-bearing pile - refers to passing through the soft soil layer and transferring the load of the building through the pile to the hard soil layer or rock layer at the end of the pile superior. The friction effect of the softer soil on the pile side on the pile body is very small, and its friction force can be ignored.

② Friction pile - refers to sinking into a soft soil layer to a certain depth through the friction of the soil on the side of the pile, transferring the upper load to the soil around the pile, and the soil at the end of the pile also plays a certain supporting role. The soil supported by the pile tip is not very dense, and when the pile has a certain relative displacement relative to the soil, it has the effect of friction pile.

3. Different materials according to the pile body

①Reinforced concrete piles

They can be prefabricated or cast-in-situ. Depending on the design, the length and cross-sectional dimensions of the piles can be chosen arbitrarily.

② Steel piles

Commonly used steel pipe piles with a diameter of 250~1200mm and wide-wing I-shaped steel piles. Steel piles have a larger bearing capacity and are more convenient for lifting, transporting, sinking and connecting piles, but they consume a lot of steel and are expensive to build. Our country is currently only used in a few key projects. For example, in the Shanghai Baoshan Iron and Steel Plant project, a large number of steel pipe piles with diameters of 914.4mm and 600mm and a length of about 60mm are used for important and high-speed equipment foundations and column foundations.

③Wood piles

Currently, they are rarely used and are only used in certain reinforcement projects or temporary projects where local materials can be obtained. Wood has good durability when below the water table, but is highly susceptible to corrosion in alternating wet and dry environments.

④Sand and gravel piles

Mainly used for foundation reinforcement and soil compaction.

⑤Gray soil piles

Mainly used for foundation reinforcement.

4. According to the use function of the piles

①Vertical compression piles

②Vertical pull-out piles

③Horizontal Load piles

④Composite stress piles

5. According to pile diameter

①Small diameter piles d ≤250mm

② Medium diameter piles 250mm< d < 800mm

③Large diameter piles d ≥ 800mm

6. According to hole forming method

①Non-squeezing soil pile mud retaining wall Grouting piles and artificial digging piles are widely used.

② Partially squeezed soil piles are drilled first and then driven.

③Squeeze piles and drive piles.

7. According to the production process

① Precast piles

Reinforced concrete precast piles are prefabricated in factories or construction sites and are driven in with hammers and vibrated. Make the pile sink into the ground by other methods.

② Cast-in-place piles

Also called cast-in-place piles, holes are formed directly on the foundation where the piles are designed. A steel cage is placed in the hole or no steel bars are placed, and then the pile is placed in the hole. Piles are formed by pouring concrete.

Compared with prefabricated piles, steel can be saved. When the bearing layer is undulating, the pile length can be designed according to the actual situation.

8. According to the cross-sectional form

① Square cross-section piles

It is more convenient to make, transport and stack. The side length of the cross-section is generally 250~550mm.

②Circular hollow piles

are prefabricated in the factory using the centrifugal rotation method. They have the characteristics of low material consumption, light weight and large surface area. Domestic railway departments have finalized products with diameters of 300mm, 450mm and 550mm, pipe wall thickness of 80mm, and lengths of each section ranging from 2m to 12m.

In fact, there should be single piles and group piles.

:wenku.baidu./view/e93d218e22bcd126ff0cdd. What are the differences according to the different classification methods of decision-making subjects?

1. According to the different status of administrative decision-making subjects, it can be divided into national decision-making and local decision-making

2. Based on the differences in the scale and degree of impact of the issues involved in administrative decision-making, it can be divided into strategic decision-making and tactical decision-making. Based on the differences in the scale and degree of impact of the issues involved in administrative decision-making, tactical decision-making. Strategic decision-making is Refers to decisions and tactical decisions on major issues with an overall and directional nature. Strategic decisions refer to decisions on major issues with an overall and directional nature. They have deep and far-reaching impacts and involve a wide range. Tactical decisions are for strategic decisions. Local or phased decisions made and served by decision-making offices. Administrative leaders at all levels must concentrate on strategic decisions and phased decisions. Administrative leaders at all levels must concentrate on strategic decisions and tactical decisions. Guide subordinates or various functional departments to carry out. Guide subordinates or various functional departments to carry out.

3. According to the different nature of decision-making objectives, it can be divided into programmed decision-making and non-programmed decision-making. Programmed decision-making is based on Depending on the nature of the goal, it can be divided into programmed decision-making and non-programmed decision-making. Decision-making is a decision-making on recurring problems with certain routines to follow; Decision-making is a decision-making on recurring problems with certain routines to follow. ;Non-programmed decision-making is a decision-making on a problem that occurs accidentally or for the first time, and there are no existing norms and principles to follow.

4. Based on the difference in decision-making conditions and results, it can be divided into deterministic decision-making and non-deterministic decision-making. Determination can be divided into deterministic decision-making and non-deterministic decision-making based on the difference in decision-making conditions and results. Decision-making refers to the process of facing certainty The environment and conditions, the results of different plans are also certain, type decision-making refers to the decision-making that faces certain environment and conditions, the results of different plans are also certain, so the best plan can be selected according to the requirements; uncertainty type decision-making refers to Decision-making refers to the decision to choose the best plan when facing a variety of uncertain environments and conditions; uncertain decision-making refers to facing a variety of uncertain environments and conditions, and the results of each plan under different environments and conditions It is also uncertain, so there is no certainty in choosing a plan. The results of each plan under different environments and conditions are uncertain, so there is no certainty in choosing a plan. It is a risky decision. A risky decision. According to Different classification methods classify petroleum

Petroleum products can be divided into six categories: petroleum fuel, petroleum solvents and chemical raw materials, lubricants, paraffin, petroleum asphalt, petroleum coke, etc. Among them, the output of various fuels is the largest, accounting for about 90% of the total output; the variety of lubricants is the largest, accounting for about 5%. Countries have formulated product standards to meet the needs of production and use.

Gasoline

is the most consumed product. The boiling point range (also called distillation range) of gasoline is 30~205°C, and the density is 0.70~0.78 g/cm3. Commercial gasoline is classified according to the anti-knock combustion performance of the oil when burning in the cylinder, and is marked as spicy. Alkane number 70, 80, 90 or higher. The number is very large and the performance is very good. Gasoline is mainly used as fuel for cars, motorcycles, speedboats, helicopters, and agricultural and forestry aircraft. Additives (such as the antiknock agent tetraethyl lead) are added to commercial gasoline to improve usage and storage performance. Due to environmental protection requirements, the content of aromatic hydrocarbons and lead will be restricted in the future.

Jet fuel

Mainly used by jet aircraft. The boiling point range is 60~280℃ or 150~315℃ (commonly known as aviation gasoline). In order to meet the needs of high-altitude, low-temperature and high-speed flight, this type of oil requires high calorific value and no solid crystallization at -50C. The boiling point range of kerosene is 180~310℃, which is mainly used for lighting and domestic cooking. The flame is required to be stable and bright without black smoke. The current output is not large.

Diesel oil

There are two boiling point ranges: 180~370℃ and 350~410℃. For petroleum and its processed products, it is customary to call those with a low boiling point or boiling point range light, and those with a low boiling point range are called heavy. Therefore, the former is called light diesel and the latter is called heavy diesel. Commercial diesel is graded according to freezing point, such as 10, -20, etc., indicating low operating temperature. Diesel is widely used in large vehicles and ships. Since high-speed diesel engines (for automobiles) are more fuel-efficient than gasoline engines, the demand for diesel is growing faster than gasoline, and some small cars are also switching to diesel. The quality requirements for diesel fuel are good combustion performance and fluidity. Combustion performance is expressed by the cetane number. The higher the better, and the cetane number of diesel fuel made from Daqing crude oil can reach 68. The cetane number of light diesel used in high-speed diesel engines is 42 to 55, and that of low-speed diesel engines is below 35.

Fuel oil

Used as fuel for boilers, ships and industrial furnaces. Commercial fuel oils are distinguished by their viscosity.

Petroleum solvent

Used as a solvent in flavors, greases, reagents, rubber processing, and coating industries, or for cleaning instruments, meters, and mechanical parts.

Lubricating oil

Lubricating oil made from petroleum accounts for more than 95% of the total lubricant production. In addition to lubrication properties, it also has the functions of cooling, sealing, anti-corrosion, insulation, cleaning, and energy transmission.

The largest output is internal combustion engine oil (accounting for 40%), and the rest are gear oil, hydraulic oil, turbine oil, electrical insulating oil, and compressor oil, accounting for 40% in total. Commercial lubricating oils are classified according to viscosity. Machinery with heavy load and low speed should use high viscosity oil, otherwise low viscosity oil should be used. The oil refining unit produces base oil made by various refining processes, plus a variety of additives, so it has special functions and high added output value.

Grease

Commonly known as butter, it is a solid or semi-fluid made of lubricant and thickener. It is used in bearings and gear parts where lubricating oil is not suitable.

Paraffin oil

Including paraffin (accounting for 10% of total consumption), ozokerite, petroleum grease, etc. Paraffin wax is mainly used as packaging materials, cosmetic raw materials and wax products, and can also be used as chemical raw materials to produce fatty acids (soap raw materials).

Petroleum asphalt

Mainly used for roads and construction.

Petroleum coke

is used as electrodes in the metallurgy (steel, aluminum) and chemical (carbide) industries.

In addition to the above-mentioned petroleum products, each refining unit also obtains some products that are gases at normal temperatures, collectively referred to as refinery gas, which can be directly used as fuel or pressurized and liquefied to separate liquefied petroleum gas, which can be used as raw materials or Chemical raw materials. The refinery provides a wide variety of chemical raw materials and is the raw material base for organic chemical products. Various oils and refinery gases can be selected according to different production purposes and production processes. Gaseous raw materials under normal pressure are mainly used to produce ethylene, propylene, synthetic ammonia, hydrogen, acetylene, and carbon black. Liquid raw materials (liquefied petroleum gas, light gasoline, light diesel, heavy diesel) can be cracked to produce most of the basic raw materials (except acetylene) required for the development of petrochemical industry, which is the basis for the development of petrochemical industry. At present, crude oil is seriously coked due to high temperature, and basic organic raw materials cannot be directly produced. Refineries are also suppliers of important aromatic hydrocarbons such as benzene, toluene, and xylene. Finally, it should be pointed out that there are more or less additives added to gasoline, aviation kerosene, and diesel to improve use and storage performance. The products produced by each refining unit must be blended with additives and oils from different units according to commodity standards before they can be used as commodities. Petroleum additives are used in small quantities and have great effects. They are fine chemical products of chemical synthesis. They are necessary for the development of high-end products and should be vigorously developed. What are the different classification methods of measuring flow meters?

According to the type of flow measured: volume flow meter and mass flow meter.

According to the measurement principle: velocity flow meter, volumetric flow meter, mass flow meter.

Common flowmeters include: differential pressure flowmeter, oval gear flowmeter, waist wheel flowmeter, scraper flowmeter, float flowmeter, turbine flowmeter, vortex flowmeter, electromagnetic flowmeter , ultrasonic flowmeter, weir flowmeter, target flowmeter, etc.

Real estate enterprise contract classification method

A. Purchase and sale contract

B. Construction and installation project contracting

C. Technology development and transfer, Consulting, service contract

D. Processing contract, customization, advertising, printing contract

E. Survey, design contract

F. Leasing

Example: Company name: Beijing 12 Real Estate Development Co., Ltd.

Company 12 (the 56th contract) signed an advertising contract with a certain company on February 22, 2006

Contract number: Beijing 12 He[D]Zi 2006 No. 56

Of course, there are many ways to number the contract. Once the contract number is determined, it cannot be changed. Classification method of infertility

1. According to the nature of infertility, it can be divided into physiological infertility and pathological infertility.

2. It can be divided into primary infertility and secondary infertility according to whether there has been a history of pregnancy.

3. According to the possibility of pregnancy, it is divided into absolute infertility and relative infertility.

4. According to the different diseased organs that cause female infertility, it can be divided into ovarian infertility, fallopian tube infertility, uterine infertility, cervical infertility, vulvar and abnormal infertility.

5. Congenital developmental infertility of the reproductive system.

6. Immune infertility.

7. Infertility caused by many factors that reduce fertility.

8. Iatrogenic infertility.

9. Non-specific, specific and sexually transmitted infectious infertility. The classification method of force

It can be divided according to the effect of force, including tension, pressure, support force, power, resistance, etc. It can also be divided according to the nature of force, including gravity, elasticity, friction, etc.

Chemical reactions are classified according to different classification methods

A+B=AB combination reaction, AB=A+B decomposition reaction, AB+C=AC+B displacement reaction, AB+CD=AC+BD metathesis reaction, These are the four basic reaction types. In addition, there are flame reaction, reduction reaction and other steel classification methods?

Steel is an iron-carbon alloy. The properties vary depending on the C content. The uses are also different. Also affected by heat treatment.

According to the difference in C content and structure, it can be divided into:

(1) Industrial pure iron is an iron-carbon alloy with C content <0.0218%;

( 2) Carbon steel is an iron-carbon alloy with a C content of 0.0218%-2.11%, which includes sub-analytical steel\***analytical steel\ and post-analytical steel;

(3 ) The C content of white cast iron is between 2.11% and 6.69%. Because the fracture surface is white, it is called white cast iron, which is further divided into sub-crystalline white iron, gold-crystalline white iron and super-crystalline white iron.