How to calculate the neutron number? Can you give an example?

How to calculate neutron number? Can you give me an example? Neutron number = mass number-proton number.

Mass number ≈ relative atomic mass (for example, chlorine, 35.5 is unexpected)

Proton number = atomic number = nuclear charge number

NH3, mass number 14+3= 17, proton number 7+3= 10, neutron number 17- 10=7.

How to use try catch in php? Can you give me an example? When an exception is thrown, the subsequent code will not continue to execute, and PHP will try to find the first catch that matches it. If no exception is caught, and it is useless to use set_exception_handler () to handle it accordingly, PHP will generate a serious error and output a message that no exception is caught. ...

Throw an exception:

& lt？ Server-side programming language (abbreviation of professional hypertext preprocessor)

Try {

$error =' This error is always thrown';

Throw a new exception ($ error);

Echo "never executed";

} catch (exception $e) {

"echo" caught an exception: ",$ e->; getMessage()，" \ n "；

}

echo‘Hello World’；

? & gt

How to use the StringToWideChar function? Can you give me an example, var?

Ss: string;

c:pwidechar；

begin

stringtowidechar(ss，c，length(s))；

....

End;

How do animals escape the heat (for example) Several puppies fell asleep by sticking their heads on a bottle of frozen mineral water in order to escape the heat.

An Indian Rock Python dish refuses to leave the basin at the zoo in Lucknow, northern India, on June 22nd. The continuous high temperature weather in India has killed more than 300 people.

A little monkey is enjoying its fruit ice.

A dog is extremely hot, playing in the salon on the grassland to cool down.

In a market in London, England, a little penguin sits on a table made of Zhang Bing.

In a zoo in Tokyo, Japan, a polar bear eats ice cubes in the water to cool down.

A Mediterranean macaque chews a popsicle to cool down at the Neumü nster Zoo in Germany.

In the zoo in Erfurt, eastern Germany, a 7-year-old African elephant is happily taking a bath to cool off.

A baboon took its baby to play in a pool to escape the heat.

A monkey put his cheek on the ice to cool down.

Two kittens climbed a tree to escape the heat.

A proud peacock shows off her beautiful feathers in the Peacock Garden in Husha Scenic Spot, Ningxia. To lower the body temperature.

Recently, the high temperature in Beijing continued, and the pet cat at home couldn't stand the heat, so she blew an electric fan.

Take a day trip as an example. 1. Walking on the road, I was knocked down by a man running in a hurry, thinking that the man must be very anxious and decided not to chase.

2. Students talk to themselves in a bad tone, so bear with it.

When a friend has too many things to do, he will forget what he told him. Don't mention it when he finishes it silently. Be considerate of him.

Someone else's dog ran into his house and made a mess. Then he thought about quietly packing up and taking the dog back.

Don't pursue friends who accidentally break or lose their own things.

6. Buy a defective one and replace it with a new one. Don't let the store lose more money.

7. Annoying people are rude to you, so take a step back.

8. When eating in a restaurant, the waiter accidentally spilled water on you. Smile and tell him it's okay.

Just eight.

Iphone id line give an example of Apple ID: how to retrieve Apple ID

Learn how to get an Apple ID back if you forget it or are not sure if you have it.

Apple ID is the user name used to perform all Apple-related operations, including shopping in iTunes Store, logging in to iCloud, purchasing applications, using iMessage, and so on. That's why it's best to use a single Apple ID and remember it. Using multiple Apple ID may cause confusion, which may lead to problems in accessing purchased content or using certain services.

If you forget your Apple ID, please follow these steps to get it back:

Go to my Apple ID (appleid.apple./) and click "Find Your Apple ID".

Enter your first name, last name, current email address, and any previous email addresses that you might have used to create an Apple ID. Apple will use this information to search for Apple ID.

If you don't find an Apple ID, please follow the instructions on the screen to create an Apple ID.

If you find an Apple ID, choose whether to receive email from Apple or answer security questions. These two options will be provided by asking you to reset your Apple ID password. Follow the instructions provided.

If more than one Apple ID is found, please select the Apple ID that matches your current email address. Then choose whether to receive emails from Apple or answer security questions. These two options will be provided by asking you to reset your Apple ID password. Follow the instructions provided.

How to input code for the left function in vb, give an example. The left function takes the characters on the left side of the string, such as:

Left("abcdef ",3) returns" abc "

How to keep a diary? For example, thank you! The format of the diary:

The text of the diary is the main part of the diary, written directly under the week and date. You can write it in the top box or indent it by 3 to 5 letters.

Example:

Nap storm

165438+ Thursday, October 25th

At noon today, there was a "rainstorm" in my home. This "rainstorm" was caused by such a trivial matter as a nap. I am the protagonist of this "rainstorm". After lunch, I turned on my computer and got ready to surf the Internet with great interest. My mother saw it and urged me to take a nap. I was impatient when I heard it: "Go to sleep, go to sleep, and you will know that you are asleep!" " ""I want you to sleep, it's all for your own good! " Mom is a little angry, too. But I couldn't listen to a word my mother said, so I talked back to my mother and caused an uproar. Finally, I couldn't help crying.

It's a pity to think about what happened afterwards. What my mother said is really reasonable. Lack of sleep will not only affect health, but also affect learning. I really shouldn't talk back to my mother unreasonably.

Relevant significance of diary:

1, cultivate perseverance

It is not difficult for a person to keep a diary for a few days, but it is difficult to keep a diary for a lifetime. This is not easy to do, but if you stick to it, it will be a great exercise of your perseverance and character. Mr. Lu Xun keeps a diary every day. After his death, his wife Xu Guangping compiled and published his diary, which is an important historical material for studying Mr. Lu Xun. The reason why Mr. Lu Xun can become a generation of writers is inseparable from his perseverance and perseverance in keeping a diary.

2. Practice writing

Writing and expression ability is one of the most important abilities that a person should have in his life, and keeping a diary is undoubtedly one of the main means to improve writing and expression ability. Diary is free and flexible, no need to think about articles. A diary can be long or short, and it can be long or short. You can write more sentences when you have time when you are happy, and you can write fewer sentences when you are depressed and unhappy.

Step 3 record "history"

The "history" here mainly refers to your personal growth history. "Diary is the most faithful growth record. There are" major "events that I think should be remembered in personal history, the process of continuous enrichment and maturity of thoughts and emotions, laughter and tears. These are the most precious wealth. The diaries of countless people are a national history, a national history and a human history.

How to change the affirmative sentence, give an example, ok? Did you eat today? Change: You ate today.

Language translocation (for example). Jiangxi people are not afraid of spicy, Hunan people are not afraid of spicy, and Sichuan people are afraid of spicy.

Read, read, read.

It is difficult to be a man, difficult to be a man, difficult to be a man.

It is bitter to miss a woman, miss a woman, miss a woman, miss a woman.

Miss a woman is bitter, miss a woman, miss a woman, miss a woman crying.

Easy to make money, easy to make money, easy to make money, and earn money for service.

Eat, eat, eat, eat.