题目内容

如图所示,水从水箱流经直径为d=2.5cm的管道流入大气中。当出口流速为 10m/s时,质量流量Qg=()。

A. 490kg/s
B. 4.9kg/s
C. 0.0049kg/s
D. 0.00049kg/s

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