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石油噴標是什麼

發布時間: 2025-05-05 13:56:39

A. 消防噴淋上噴,下噴在平面圖紙上的標示有區別嗎

有區別的。。如果管道穿過圓圈，表示是下噴。如果管道不穿過圓圈，圓圈空心，表示上噴。如果管道不 穿過圓心，且圓內多一個小圓，那表示要做上下噴

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