fire rated penetration是什么意思


中文翻译防火洞孔

网络释义

1)fire rated penetration,防火洞孔2)Grill-protected openings,防火孔/口3)light back resistant flame port,防回火火孔4)prevention of exposed refovcing bars in utensil holes,孔洞露筋通病防治5)cavity,孔洞6)void,孔洞

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