题目内容
（请给出正确答案）
[主观题]
Thechildrenwillhaveto_________theirplay-timehourswhenschoolopens.A.cut in B.cut
The children will have to _________ their play-time hours when school opens.
A.cut in
B.cut up
C.cut on
D.cut down
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A．绝热压缩
B．多变压缩
C．绝热压缩与等温压缩
D．等温压缩
