工芸基礎知識（選択問題）20180313
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三スクリューポンプの主スクリューおよび従動スクリューのねじ山数。 A. どちらも単頭 B. どちらも双頭 C. 前者は単頭、後者は双頭 D. Cとは逆
C.前者は単頭、後者は双頭
三スクリューポンプの主スクリューおよび従動スクリューのねじ山数B。 A. どちらも単頭 B. どちらも双頭 C. 前者は単頭、後者は双頭 D. Cとは逆
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