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【单选题】
三相绕线异步电动机进行电压反接制动时 , 在转子串电阻的主要目的是 ( )。A.
降低电流
B.
提高起动转矩
C.
降低起动转矩
D.
降低电压
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举一反三
【单选题】The village seemed _____, the only sign of life _____ some trees waving in the howling wind. [ ]
A.
alone; were
B.
deserted; being
C.
lonely; was
D.
abandoned; to be
【简答题】阅读理解. Howling(吼叫) is a behavior commonly observed among a wolf pack(狼群). As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. Ther...
【单选题】Having heard wolves howling in the forest, Lala her walk up the path to the caves fearing that there might be wild beasts lying in wait for her．
A.
accumulated
B.
circulated
C.
accelerated
D.
calculated
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