工芸基礎知識（選択問題）2018023
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以下の往復ポンプの中で、流量が最も均一なのは○○ポンプです。 A. 単作用 B. 双作用 C. 三作用 D. 双筒四作用
以下の往復ポンプの中で、流量が最も均一なのはCポンプです。 A. 単作用 B. 双作用 C. 三作用 D. 双筒四作用
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