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【单选题】
（）战争是信息化战争的雏形。A.
海湾战争
B.
科索沃战争
C.
阿富汗战争
D.
伊拉克战争
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举一反三
【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 indicate...
A.
flexible
B.
simplified
C.
compulsory
D.
voluntary
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