Represents the friction calculation chart of the duct for graphic calculation during project design.
Represents the friction calculation chart of the duct for graphic calculation during project design.
给出了柔性风管完全展开时的阻力计算图，可供工程设计时使用。
Represents the friction calculation chart of the duct for graphic calculation during project design.
给出了柔性风管完全展开时的阻力计算图，可供工程设计时使用。