单选：在达西公式hf=[λ（L/D）]（v2/2g）中，"D"表示的是（）。

题目分类：安全生产法及相关法律知识
题目类型：单选
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题目内容：

在达西公式hf=[λ（L/D）]（v2/2g）中，"D"表示的是（）。
A．管道长度
B．水力半径
C．沿程阻力系数
D．管道直径

参考答案：

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