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【判断题】
电源电动势的方向是由电源的负极指向电源的正极。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】14 She spends almost an hour ___ herself before going out every day, which is why she is often late for class.
A.
granting
B.
groaning
C.
gossiping
D.
grooming
【单选题】单相桥式整流电容滤波电路如图6-20所示,已知交流电源频率f=50Hz,u2的有效值U2=15V, RL=50Ω，则流过二极管的平均电流为：
A.
0.18A
B.
0.25A
C.
0.47A
D.
0.53A
【单选题】单相桥式整流电容滤波电路如图6-20所示,已知交流电源频率f=50Hz,u2的有效值U2=15V, RL=50Ω，则输出电压Uo的平均值为：
A.
12V
B.
15V
C.
18V
D.
21V
【单选题】单相桥式整流电容滤波电路如图6-20所示,已知交流电源频率f=50Hz,u2的有效值U2=15V, RL=50Ω，则滤波电容C容量的大小为：
A.
1000μF
B.
2200μF
C.
3300μF
D.
100μF
【单选题】She spends almost an hour ____ herself before going out every day, which is why she is often lat for class.
A.
granting
B.
groaning
C.
gossiping
D.
grooming
【单选题】She spends almost an hour ____ herself before going out everyday, which is why she is often late for class.
A.
granting
B.
groaning
C.
gossiping
D.
grooming
【单选题】Before going for arbitration, both parties involved in a dispute need to make an arbitration agreement in written form, in which they agree to refer the subject in dispute to a third party. This indic...
A.
flexible
B.
necessary
C.
compulsory
D.
firm
【单选题】Before going for arbitration,both parties involved in a dispute need to make an arbitration agreement in written form,in which they agree to refer the subject in dispute to a third party.This indicate...
A.
flexible
B.
simplified
C.
compulsory
D.
voluntary
【简答题】It is extremely important for a job applicant to___ ____ ________ before going on an interview.
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