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【判断题】
滚子链传动存在多边形效应,会导致平均传动比不均。A.
正确
B.
错误
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【单选题】Haven't we told you that you _______ have 25 dollars if you have fixed our computer?
A.
shall
B.
would
C.
should
D.
could
【简答题】•What differences between senior high school and university have you noticed since you have entered our school? Have these differences caused any pressure on you? •What pressures have you felt during...
【简答题】2-21 电路如题图 2-21 所示, U S = 30 V , I S = 1A 。试用节点电压法求各节点电压及各电源发出的功率。
【简答题】2 如下图所示电路, i 1 =3A, u 2 =4V 。求电压 u,u s 和电阻 R, 并求电源、受控源发出的功率。
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