(20 14? Feicheng simulation) Two physical experimental groups A and B use the same device as shown in Figure A to explore the "boiling of water" experiment. As can be seen from the table, this time,

At (1) standard atmospheric pressure, the temperature of boiling water is 100℃, the boiling point of alcohol is 78℃, and the boiling point of mercury is 357℃. The boiling point of mercury is higher than that of boiling water, so choose a mercury thermometer to measure the temperature of boiling water.

(2) Reading Figure B, we can see that under the same heating conditions, the temperature of B rises slowly, which should be because the mass of water is more than that of A;

(3) It takes a long time from water heating to water boiling, which may be because there is too much water or the initial temperature of water is too low; When the water quality is moderate and the initial temperature of water is not low, the firepower may be too small. Therefore, to reduce the time from the beginning of heating to boiling, we can reduce the water quality, increase the initial temperature of water or switch to alcohol lamps with greater firepower.

So the answer is:

(1) mercury; (2) quality; (3) reduce water quality.