【共同学*】【電気版20160315】
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参加報酬：2富。正解の報酬：9富。 電動機の容量が大きく、頻繁な起動が許されない場合に適した降圧起動方法は( )です。 A Y－△ B自動変圧器 Cステーター串抵抗 D延辺三角形
この投稿は、最後にsdliuttによって2016年3月15日09:25に編集されました。B
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