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【单选题】
多级压缩机每一级排出的气体温度较高,在进入下一级进行压缩需要先( )。A.
冷却降温
B.
循环使用
C.
润滑摩擦
D.
往复推送
手机使用
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【简答题】下列各句均有一处错误，请找出并改正。 ( )1. The boy is good at play football. A B C D ( )2. He often plays a piano A B C D ( )3. He is born in Beijing A B C D ( )4. When did he ...
【简答题】用所给单词的适当形式填空。 1. I won't leave until it ____ (not) rain. 2. He often hears the boy____ (play) the guitar, 3. If you drink some tea before going to bed, you will be possibly____(wake) and can't easily...
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