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【判断题】
当牵连运动为平移时，相对加速度矢量等于相对速度矢量对时间的一阶导数。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】nervou s,speech I when I give a .
【简答题】直流发电机电刷在几何中线上，如果磁路不饱和，这时电械反应是() A去磁 B助磁 C不去磁也不助磁
【单选题】Hi, Mark. How was the musical evening? — Excellent! Ales and Andy performed _________ and they won the firs prize.
A.
skillfully
B.
commonly
C.
willingly
D.
nervously
【简答题】As long as there is water, plants won ’t die quickly.英译汉
【单选题】— Hi, Mark. How was the musical evening? — Excellent! Ales and Andy performed _____ and they won the first prize. [ ]
A.
skillfully
B.
commonly
C.
willingly
D.
nervously
【单选题】Trump quickly won his party's nomination to ____ the elections.
A.
contract
B.
contest
C.
contact
D.
content
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