变管径流动中,D1=400mm,D1=200mm。流速v1=2m/s,则流速v2

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问题 变管径流动中,D1=400mm,D1=200mm。流速v1=2m/s,则流速v2为( )。A 2m/sB 4m/sC 8m/sD 16m/s

选项

答案C

解析
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