有兩根管徑大小不同的輸水管，若其長度和布置方式完全相同，管材均采用水泥砂漿內襯的鋼管，粗糙系數n均取0.013，下列有關其輸水特征比較的判斷中，哪項不正確?(??)
A、若管道流速相同，兩根管道水力坡降之比僅與管徑有關C
暫無解析
Wateriscomposed_______hydrogenandoxygen.
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