Only in this way _____ do it well.
A. you are able to
B. are you able to
C. are able to yo
D. can you able to
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That question _____ we need it has not been considered.
A. that
B. how
C. where
D. whether
I’ m sorry we have sold _____ the trousers _____ your size.
A. out;in
B. off;with
C. away;of
D. on;in
在速度平行四边形中,绝对速度一定在平行四边形的对角线上。
A. 对
B. 错
一般情况下,牵连速度是牵连点的速度,牵连点的位置不同,则牵连速度不同。
A. 对
B. 错