(multiple choices) Xiaoming's family is going to travel for half a month. In order to keep the bonsai at home full of water, Xiao Ming put some water in a bottle and put it in a basin.

A: If the gas pressure in the bottle decreases, the pressure inside and outside the bottle will be unbalanced, and under the action of force, it will eventually restore balance, so A is wrong. In fact, it is achieved by adjusting the height difference between the inside and outside of the bottle.

B: The water in the tank gradually decreases with evaporation, so the pressure decreases with the decrease of height. B correct

C: With less water, the pressure will naturally decrease. C is wrong.

D: As water flows out of the bottle, the gas pressure in the bottle decreases. In order to maintain the internal and external pressure balance, the outflow of water is always less than the evaporation of water in the tank, which gradually increases the height difference between the internal and external water surfaces of the bottle and maintains the pressure balance. correct