工芸基礎知識（選択問題）20180728
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工程基礎知識（選択問題）20180728 油圧駆動と電気駆動の方式を比較した場合、欠点の一つは 。 A．製造コストが高い B．速度調整が困難 C．動作が不安定 D．過負荷防止能力が低い
まさかソファ~~~Aを選ぶ~~
油圧駆動は電気駆動と比べて、欠点の一つがbです
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