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【单选题】
Z3040型摇臂钻床中摇臂不能夹紧的可能原因是( )。A.
速度继电器位置不当
B.
行程开关SQ3位置不当
C.
时间继电器定时不合适
D.
主轴电动机故障
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皮皮学刷刷变学霸
举一反三
【单选题】It was the boy, rather than his teachers, that _____________ for what the boy had done.
A.
were to blame
B.
were to be blamed
C.
was to blame
D.
was to be blamed
【单选题】下面关于牛顿万有引力定律说法错误的是（）
A.
引力大小与质点质量和距离有关
B.
严格来说仅适用于质点
C.
以欧几里得空间作为框架
D.
在万有引力定律中，时间和空间不是相互独立
【单选题】—Where was the boy taken away by the UFO? —Oh, it was in the lake ______ he was swimming. [ ]
A.
that
B.
where
C.
because
D.
at which
【单选题】Which inference is more firmly based on the information in the passage? Early one morning, a man was walking along a sandy, deserted beach. At least he thought it was deserted. As he gazed ahead of hi...
A.
The boy knows he cannot save all the starfish.
B.
The man believes the boy’s efforts are admirable.
【简答题】什么是“耦合小、内聚大”原则，请简要说明。
【简答题】批量制作邀请函,完成后提交。
【单选题】It was amazing that the boy was able to solve the problem so quickly.
A.
frustrating
B.
confusing
C.
reasonable
D.
surprising
【单选题】关于牛顿第二定律,下列说法错误的是
A.
当物体的质量确定时，在力的作用下产生的加速度的大小正比于合外力的大小
B.
物体所受的力 与加速度 具有瞬时对应关系
C.
在某一方向上受力只能产生该方向的加速度
D.
牛顿第二定律可以适用于非惯性参考系
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