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\u96f7\u8bfa\u6570\u672c\u6587\u6a21\u62df\u8bbe\u5b9a\u5cb8\u6865\u5468\u56f4\u7684\u6d41\u4f53\u662f\u6709\u7c98\u6027\u7684\u7a7a\u6c14\u6c14\u4f53\uff0c\u5728\u6d77\u5e73\u9762\u9ad8\u5ea6\uff0c\u4e00\u4e2a\u6807\u51c6\u5927\u6c14\u538b\uff0c15\u00b0\u65f6\uff0c\u7a7a\u6c14\u5bc6\u5ea6\u03c1 =1.205 kg\/m3\uff0c\u52a8\u529b\u7c98\u6027\u7cfb\u6570\u03bc =1.81\u00d710-5 N\u00b7s\/m2\uff0c\u8fd0\u52a8\u7c98\u5ea6\u03c5 =\u03bc \/\u03c1 ,\u03c5 =1.502 07\u00d710-5 m 2\/s\uff0c\u98ce\u901fv =20 m\/s\uff0c\u8fd9\u6837\uff0c\u7531\u8ba1\u7b97\u57df\u5165\u53e3\u5c3a\u5bf8\u8ba1\u7b97\u5f97\u5230\u7684\u96f7\u8bfa\u6570\u4e3aRe=\u03c5l\/v =(20\u00d77)\/ 1.50207\u00d710-5 \u8fdc\u5927\u4e8e2 000\uff08\u4e34\u754c\u96f7\u8bfa\u6570\uff09\u5f0f\u4e2d\uff1av \u4e3a\u5e73\u5747\u6d41\u901f\uff0cm\/s\uff1bl \u4e3a\u7279\u5f81\u957f\u5ea6\uff0cm;\u03c5\u4e3a\u8fd0\u52a8\u7c98\u5ea6,m2\/s\u3002\u8be5\u6d41\u52a8\u5c5e\u4e8e\u9ad8\u96f7\u8bfa\u6570\u7684\u6e4d\u6d41\u30023.4 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