题目内容

气缸内有一定量的理想气体,先使气体做等压膨胀,直至体秘加倍,然后做绝热膨胀,直至降到初始温度,在整个过程中,气体的内能变化△E和对外做功W为()。

AE=0,W>0
B. AE=0,W<0
C. AE>0,W>0
D. AE<0,W<0

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D. 1.0×10-5

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It was not a grand occasion, so we were allowed to wear _____ clothes.

A. formal
B. causal
C. simple
D. plain

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