伺服電動機必須具備的特點為？(A)啟動轉矩小(B)轉子慣性大(C)可正轉反轉，且時間常數小(D)以上皆非

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31. 伺服電動機必須具備的特點為？
(A)啟動轉矩小
(B)轉子慣性大
(C)可正轉反轉，且時間常數小
(D)以上皆非

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