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【判断题】
链传动的平均传动比恒定不变。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】改错题: Today was my father’ s birthday, which was so a big day for me, so I wanted to give her a surprise. My father always gave me that I wanted. I told my mother that I wanted to cook a delicious dinn...
【单选题】I think it ’ s high time that we ______strict measures to stop pollution.
A.
will think
B.
take
C.
took
D.
have taken
【单选题】图书出版者对其出版的图书的版式设计享有专有使用权，有权许可或禁止他人使用其出版的图书的版式设计。该权利的保护期为( )。
A.
10年
B.
20年
C.
30年
D.
40年
【单选题】It ’ s fortunate that I met a good teacher of Chinese. O therwise, I ______ on this tortured language a long time ago.
A.
would have given up
B.
had given up
C.
would give up
D.
gave up
【简答题】是通过改变现有酶分子的活性来调节代谢速率,包括酶活性的 和 。
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