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【简答题】
现有一 RL 串联交流电路,电源电压为 220V ,频率为 50Hz ,现测得电路的有功功率为 940W ,电流为 5A ,则电阻为____Ω,电感为______mH(结果保留一位有效数字)
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【简答题】完形填空。 Each of us makes mistakes from time to time. In fact, we can 1 a lot from our mistakes. Donnie was a 2 student and never answered questions in class. He was 3 to make mistakes. He never finished...
【单选题】He always makes mistakes ( ) he has made mistakes before.
A.
when
B.
where
C.
if
D.
that
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