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提问人:网友f******g 发布时间:2023年1月27日 16:53
[单选题]

进行小浮标系数试验时,在每条测速垂线上,同时用流速仪和小浮标分别施测其垂线平均流速和浮标流速,重复施测()

A.3次 B.10次 C.20次 D.30次

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