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【单选题】
658.测量换向片和轴向的压降时,若测到某一换向片毫伏表读数( ),则表明这个换向片或所连接的线圈可能对地短路。A.
很小或者为 0
B.
为正常的 1/2
C.
为正常的 1/3
D.
很大
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