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【单选题】

螺旋千斤顶顶重时,不得使螺旋杆全部脱出,丝扣总数至少应留在内部()

A.
1/4
B.
2/3
C.
3/4
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参考答案:
参考解析:
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举一反三

【单选题】螺旋千斤顶属于()。

A.
传力螺旋
B.
传导螺旋
C.
调整螺旋
D.
差动螺旋

【单选题】In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went somet...

A.
horses were fairly useful in Chicago
B.
Chicago"s streets were extremely muddy
C.
Chicago was very dangerous in the spring
D.
the Chicago people were particularly humorous

【单选题】在液压千斤顶中,力的放大倍数等于(  )。 ​​

A.
大缸截面积/小缸截面积
B.
大缸直径/小缸直径
C.
大缸半径/小缸半径
D.
大缸半径*小缸半径

【多选题】下列选项中,可以采用集群液压千斤顶整体提升吊装法的有(  )。

A.
大型屋盖的吊装
B.
体育场馆钢屋架的整体滑移
C.
油罐的倒装
D.
电厂发电机组的安装
E.
大型电视塔钢桅杆天线整体提升