问题
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
答案
参考答案：A
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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
参考答案：A