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【单选题】
圆管紊流粗糙区的沿系数λ ( )
A.
( 1 ) ．与雷诺数Ｒ e 有关；
B.
( 2 ) ．与管壁相对粗糙度Δ／ d 有关；
C.
( 3 ) ．与 Re 和Δ／ d 有关；
D.
( 4 ) ．与 Re 和 l 有关。
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