不定项选择
匀加速直线运动的动荷系数总是大于1
A.正确
B.错误
匀加速直线运动的动荷系数总是大于1
A.正确
B.错误
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单项选择题
When and why he came here ________ yet.
When and why he came here ________ yet.
A.is not known
B.are not known
C.has not known
D.have not known