[单选题]
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
参考答案与解析：
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相关试题
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