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【单选题】
给水全程控制过程中,从启动至满负荷阶段,下面哪个控制顺序正确?( )
A.
单冲量控制电动泵→单冲量控制旁路阀→三冲量控制汽动泵
B.
单冲量控制旁路阀→单冲量控制电动泵→三冲量控制电动泵→三冲量控制汽动泵
C.
单冲量控制电动泵→单冲量控制旁路阀→三冲量控制电动泵→三冲量控制汽动泵
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举一反三
【判断题】竖炉冶炼时所添加的木炭只是起燃料的作用。
A.
正确
B.
错误
【单选题】往复式压缩在工作时一般在气缸内都留有余隙,这是为了()
A.
保护气缸和活塞杆
B.
提高压缩机的效率
C.
节省压缩功
D.
提高吸、排气量
【简答题】句型转换 1. He waited until his mother arrived.(改为同义句) He____ until his mother arrived. 2. I should write him a letter.(对划线部分提问) _______ ______ ________ do? 3. My shoes are out of style.(改为反意疑问句) My shoes...
【简答题】My mother arrived Beijing two days ago.
【单选题】My mother arrived___Beijing two days ago.
A.
in
B.
at
C.
on
【单选题】By the time my mother arrived home, I ____ my homework.
A.
have finished
B.
had finished
C.
finished
D.
will finish
【简答题】December 24 arrived along with a heavy snow. It was my first Christmas Eve without my mother, and the day’s usual 36 had disappeared. The telephone rang. I 37 it and went to my bedroom to bury the con...
【单选题】My mother arrived__________Beijing two days ago.
A.
In
B.
at
C.
on
【单选题】往复式压缩在工作时一般在气缸内都留有余隙,这是为了()
A.
提高压缩机的效率
B.
保护气缸和活塞杆
C.
节省压缩功
D.
提高吸、排气量
【判断题】竖炉冶炼时所添加的木炭只是起燃料的作用。
A.
正确
B.
错误
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