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【单选题】
在活塞式压缩机每个工作循环的压缩过程中，气体（）A.
分子浓度不断降低，使气体的压力降低
B.
分子浓度不断降低，使气体的压力升高
C.
分子浓度不断增高，使气体的压力降低
D.
分子浓度不断增高，使气体的压力升高
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