管槽断面主要有矩形、梯形和( )三种形式,分别如图 a 、 b 、 c 所示,采用哪一种形式应根据项目区土质、地下水位、管材型号规格、最大冻土层深度、管槽开挖深度及施工方法确定。
A.
综合式
B.
复合式
C.
U 型
D.
梯形
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