多项选择题
A.抽气压力升高 B.凝汽器真空升高 C.抽气压力降低 D.凝汽器真空降低
A.2~3 B.2~4 C.3~4 D.4~5
A.0.3% B.4% C.0.5% D.0.6%
A.105% B.110~112% C.115%
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