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【单选题】
数控车床液压系统中液压马达的工作原理与( )相反。A.
液压泵
B.
溢流阀
C.
换向阀
D.
调压阀
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反馈参考答案：
举一反三
【单选题】When the bus ______ and I got off, I was relieved because I had finished school and I had the weekend ahead of me to enjoy myself.
A.
had a halt
B.
pulled to a stop
C.
pulled down a stop
D.
pulled up
【简答题】It was a long, slow climb out of the shadows. Yet in 1970, 17 years after I left the Coast Guard, Roots was published. ____1___ I had the kind of fame and success that few writers ever experienced. Th...
【简答题】在超声治疗之前治疗部位用浓度为( )%的酒精消毒。
【简答题】Last week I visit one of my old neighborhoods in Washington D.C. I had not been there for twenty years and as I walked along the street, my mind was flooded by memories of the past. I saw the old apar...
【单选题】She asked me _______ I had returned the books to the library, and I admitted that I hadn’t.
A.
when
B.
where
C.
whether
D.
what
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