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【单选题】
等直径水管, A-A 为断面, B-B 为水平面, 1 、 2 、 3 、 4 为面上各点,各点的运动参数有以下关系( )A.
p 1 =p 2
B.
p 3 =p 4
C.
Z1+p1/r=Z2+p2/r
D.
Z3+p3/r=Z4+p4/r
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