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【判断题】
锉齿的粗细规格是按照锉刀齿纹的齿距大小来表示的,A.
正确
B.
错误
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参考解析：
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A.
he had left
B.
he has left
C.
he left
D.
he must leave
【多选题】Complete these sentences with the following choices. A. arranged B. checked in C. solution D. handle E. confirm F. essential Mike ________ a meeting with the marketing director. The company...
A.
A
B.
C
C.
D
D.
F
E.
B
F.
E
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A.
25%
B.
20%
C.
15%
D.
10%
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【简答题】为什么说放大系数是对象的静态特性，而时间常数和滞后时间是动态特性？
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