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【简答题】
移动副的自锁条件是______，转动副的自锁条件是______，螺旋副的自锁条件是______。
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反馈参考答案：
举一反三
【单选题】When Mr. Kentucky fell ill, his son took ______ the business from him.
A.
to
B.
in
C.
after
D.
over
【简答题】The fellow I _______ a worker was really a general manager. A．took in B．took down C．took up D．took for
【单选题】John took part in the games, but the rest of us just .
A.
looked up
B.
looked on
C.
looked out
D.
looked over
【单选题】Brass concert music was ______ to a new level in the 1880s when John Philip Sonsa took over the U.S. Marine Band.
A.
strengthened
B.
headed
C.
lifted
D.
briefed
【单选题】The general took over the ____________ leadership over the army.
A.
. academic
B.
absolute
【单选题】当保险事故是由于第三者责任所致时，如果被保险人在获得保险人赔偿之前放弃了向第三者请求赔偿的权利，那么（ ）
A.
被保险人可以直接向保险人索赔
B.
保险人也有权直接向第三者求偿
C.
保险人可以拒绝承担保险赔偿责任
D.
保险人赔付后无权向第三者求偿
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