圆管的水力半径R与圆管直径的关系是()。 A、R=dB、R=d/2C、R=d/4D、R=4d
圆管的水力半径R与圆管直径的关系是()。
A、R=d
B、R=d/2
C、R=d/4
D、R=4d
相关考题:
充满水的半径为R的圆管,其当量直径为()A.0.5R;B.R;C.1.5R;D.2R;
A、R=d
B、R=d/2
C、R=d/4
D、R=4d