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【单选题】
并联于无穷大电网的隐极同步发电机,当调节无功功率输出时使功率持不变,此时有( )约束存在。 这里 是功率因数角, 是功率角。A.
，
B.
，
C.
，
D.
，
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【简答题】How were myths in ancient China spread?
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【简答题】Some myths are stories told since ancient times to explain the causes for natural happenings. The Greek myth that explains why there are changes of ___1___ is about Demeter, the goddess of the harvest...
【简答题】完形填空。 Some myths (神话) are stories told since ancient times to explain the causes for natural happenings. The Greek myth that explains why there are changes of 1 is about Demerter, the goddess of the h...
【单选题】My biggest ______ was my lack of tolerance for any error.
A.
strength
B.
strong
C.
weakness
D.
weak
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【简答题】When can the earliest written records of ancient myths be traced back?
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