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【判断题】
活塞销偏置的目的是防止活塞在换向时,撞击汽缸壁而产生“敲缸”A.
正确
B.
错误
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皮皮学刷刷变学霸
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A.
better
B.
dirty
C.
more better
D.
worse
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【单选题】Whatever we do in life,wherever life's storms___us,there must be something we can achieve.
A.
toss
B.
fall
C.
throw
D.
lose
【单选题】Something ______to save our earth. Do you think so? A. can do B. must do C. has to do D. must be done
A.
1
B.
2
C.
3
D.
4
【单选题】Something ___ to save our earth. Do you think so?
A.
can do
B.
must do
C.
has to do
D.
must be done
【简答题】NPN 型晶体三极管工作在放大状态时,三个极中电位最高的是 极。 PNP 型晶体三极管工作在放大状态时,三个极中电位最高的是 极
【单选题】— What a mess! — Hurry up! Something ______. The guests are coming. [ ]
A.
must do
B.
must be done
C.
must be do
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