管溝排水
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屋外のエタノール配管は管溝に敷設し、細砂で埋め戻すが、この管溝には排水が必要か？排水はどう考えるべきか？ありがとう！個人的には、排水が必要だと思います。
個人的には排水も必要だと思いますが、どのように排出するかはよくわかりません。設計のことは分かりません
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