单项选择题
A.液压和机械B.立式和卧式C.外压和内压D.冷压和热压
A.6~8B.12~16C.16~18D.8~12
A.50%B.60%C.70%D.80%
A.立式和卧式B.机动和液动C.手动和机动D.外压和内压
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