【毎日一題】20150807号試験問題
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参加報酬:2富。正解の報酬:9富。 渦流損失を減らすには、( )という方法が用いられる。 A. 鉄心の透磁率を上げる B. 鉄心の抵抗率を上げる C. 鉄心の透磁率を下げる D. 鉄心の抵抗率を下げる生産大区の新しいイベントが始まりました。賞品も魅力的ですので、ぜひ参加してください:【生産過夏天】生産大区が「夏練三伏」モードを開始
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