如图所示变直径水管。已知管径d1=50mm,d2=80mm,断面平均流速υ1=3.5m/s,则υ2为() [img src="https://img.haodaxue.net/uploadimg/image/20200709/20200709090334_54201.png" alt="" />
A.1.37m/s
B.1.73m/s
C.2.19m/s
D.2.77m/s
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正确答案: A 答案分析:无
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B.1.73m/s
C.2.19m/s
D.2.77m/s
A.1.37m/s
B.1.73m/s
C.2.19m/s
D.2.77m/s
A.1.37m/s
B.1.73m/s
C.2.19m/s
D.2.77m/s
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B.1.73m/s
C.2.19m/s
D.2.77m/s
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B.1.73m/s
C.2.19m/s
D.2.77m/s