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【判断题】
打滑发生在小带轮上是由于计算公式最拉力的公式,从公式里面可以看到越小,所需要的初拉力越大,一般小带轮的小,故小带轮的最拉力较大,当初拉力小于最拉力时就会发生打滑现象。A.
正确
B.
错误
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【单选题】Scarcely had they settled themselves in their seats in the theatre ______ the curtain went up.
A.
then
B.
before
C.
when
D.
then
【单选题】Scarcely had we settled ourselves in our seats in the theatre ______ the curtain went up.
A.
than
B.
when
C.
as
D.
after
【简答题】完形填空。 Mama's voice floated through the apartment as she sang a Mexican folk song that I had heard all my life. 'Hola,' she greeted me when she came out of the bedroom. 'Please speak to me in 1 ,' I in...
【简答题】完形填空。 Every Saturday night Mama would sit down by the table and count out the money Papa had brought home. Mama would carefully divide big groups for the housing, and food, and one or two coins for Ne...
【单选题】Mama had the curtains drawn to keep it cool so it was _______ dark in there.
A.
in total
B.
kind of
C.
in the form of
D.
but then
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