duct friction loss 风道摩擦损失
equal friction method duct sizing 等摩阻法风道计算
duct friction
管摩擦
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Based on the analysis of the friction forces encountered by micro-cable or micro-duct to be blown in, the practicability of the utilization of old cable ducts with resident cable is illustrated.
根据用气送技术安装新设微光缆或微管道时的摩擦力分析，说明了再利用已占用管道的可行性。
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