试题详情
单项选择题断面面积均为A=0.48m2的正方形管道、宽高比为3的矩形管道和圆形管道，各自的水力半径分别为（）。

A、R正=0.174、R矩=0.15、R圆=0.195

B、R正=0.15、R矩=0.174、R圆=0.195

C、R正=0.1、R矩=0.5、R圆=0.5

D、R正=0.195、R矩=0.15、R圆=0.174

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