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【毎日のテーマ】【空調版20160927】

2016-09-27View Original

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この投稿は最後にhesonchang214によって2016-11-9 15:38に編集されました。参加報酬:2財富。正解の報酬:9富 以下のうち、( )によってサイクロン集塵機の効率が低下する。A、入口速度の増加 B、排気管の直径の増加 C、筒体の直径の減少 D、筒体と円錐部の高さの増加 正解:B

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