工芸基礎知識（選択問題）20180713
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以下のポンプは、機械自体のスライドオイルポンプとしてよく使用されるものです。 A. 外歯車ポンプ B. 三日月形隔壁付き内歯車ポンプ C. ローターポンプ D. A+B+C
ガンはDです
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