(2007? Heilongjiang) is an experimental device designed by a classmate to verify that oxygen accounts for about 15 of the total air volume. The influence of the following operation process on the expe

(2007? Heilongjiang) is an experimental device designed by a classmate to verify that oxygen accounts for about 15 of the total air volume. The influence of the following operation process on the experimental results A, the spring clip is not clamped. In the red phosphorus combustion, due to the heat release, the air volume of the device expands and escapes, and finally more water will be added to the device, making the result bigger. Therefore, this item is correct.

B, too much red phosphorus in the burning spoon will not affect the experimental results, so it is wrong.

C. Opening the spring clip before the device cools will make less water enter the gas container, resulting in smaller experimental results, so this error.

D. If the red phosphorus is ignited and put into the bottle, if the cork is not plugged immediately, the air in the gas container will escape, leading to a larger experimental result. This is correct.

So choose AD.