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题目类型: 单选题

题目内容

题目选项

A. ab段:DN50mm,通气立管(T):DN100mm,ef段:DN150mm,坡度:i=0.015
B. ab段:DN75mm,通气立管(T):DN100mm,ef段:DN150mm,坡度:i=0.020
C. ab段:DN75mm,通气立管(T):DN75mm,ef段:DN150mm,坡度:i=0.020
D. ab段:DN75mm,通气立管(T):DN100mm,ef段:DN150mm,坡度:i=0.015

正确答案

B

题目解析

题目纠错