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NBN E 17-004-1988 8750 《封闭管道中水流净量的测量 通过流速计,在水流规律的情况下,盛水管道内水流速度的勘测方法》.pdf
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NBNE1700419888750
封闭
管道
水流
测量
通过
流速计
规律
情况
水管
速度
勘测
方法
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