今有一导热性能良好的气缸,用导热活塞封闭有一定质量的理想气体

今有一导热性能良好的气缸,用导热活塞封闭有一定质量的理想气体开始时气缸水平放置如图甲所示,后将气缸按如图乙方式悬挂并保持静止,气缸不漏气且大气压及环境温度不变.下列说法正确的是

A.气体对外做功,内能减小 

B.气体对外做功,气体温度不变

C.气体体积增大,气体温度减小

D.气体体积不变,温度不变

答案

B

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