请根据右图回答,(假设装置内空气足以维持实验过程中小白鼠的生

请根据右图回答,(假设装置内空气足以维持实验过程中小白鼠的生命活动,瓶口密封,忽略水蒸气和温度变化对实验的影响),经数小时后,U 型管AB两处的液面会

AAB两处都不变           BAB两处都下降

CA处下降,B处上升         DA处上升,B处下降               

答案

D

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