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hulain
hulain
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樓主  發(fā)表于: 2014-11-22 20:49
各位！直流電機有串勵他勵并勵復勵，各有什么不同。并勵，復勵是一樣嗎？
hnyyhym
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1樓  發(fā)表于: 2014-11-22 21:15
先看書(shū)，或百度，這樣的問(wèn)題明顯是騙帖的。

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