题目:
如图所示,活塞将一定质量的气体封闭在直立圆筒形导热的气缸中,活塞上堆放细沙,活塞处于静止,先对气体缓慢加热,同时逐渐取走细沙,使活塞缓慢上升,直到细沙全部取走,若活塞与气缸之间的摩擦力可忽略,则在此过程中
[ ]A.气体的压强可能不变,内能可能不变
B.气体从外界吸热,内能一定增加
C.气体对外做功,内能一定减少
D.气体对外做功,气体温度可能不变
答案:
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