题目内容

已知某地测风在Z=20 m高度处的风速v1为23 m/s,地表粗糙度指数取0.1,则在Zn=10 m高度的风速为______ m/s。______

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The critical Reynolds number of a rough-walled pipe is about _______.

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A. density
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B. solids
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