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【单选题】
圆管紊流过渡区的沿系数λ:A.
与雷诺数Re有关；
B.
与相对粗糙 k s / d 有关；
C.
与Re及 k s / d 有关；
D.
与Re和管长L有关 。
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
国槐不适应寒冷的环境
B.
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C.
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D.
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A.
alleviate
B.
reduce
C.
shrink
D.
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相关题目：
【单选题】北京的市树是国槐和侧柏,国槐在冬天纷纷落叶,而侧柏依然郁郁葱葱,这表明( )
A.
国槐不适应寒冷的环境
B.
侧柏不适应寒冷的环境
C.
它们都不适应寒冷的环境
D.
它们都适应寒冷的环境