When doing the experiment of "observing the boiling of water", Dayong students have the following thermometers to choose from: Thermometer A, Household Thermometer B, Thermometer 10 Mercury (

(1) thermometer ranges from 5℃ to 4℃, household thermometer ranges from-0℃ to 50℃, mercury thermometer ranges from-10℃ to10℃, and alcohol thermometer ranges from-80℃ to 50℃.

(Figure) Because the outside temperature is lower than the boiling point of water, the pointer will drop by X after the thermometer is taken out of boiling water, so the measured value is less than the real value.

As can be seen from the data in the table, the initial temperature of water is 0℃ and the boiling point of water is 100℃. Before the water boils, the pointer of the thermometer keeps rising. After the water boils, continue heating for a period of time. Because the temperature of water remains constant during boiling, so does the pointer of the thermometer.

So, the answer is: (1) c; (Figure) smaller; (the) 0; 100; Promotion; there will be no changes.