【单选题】
道砟陷坑最常见的不包括( )。 ___
A. 道砟锅
B. 道砟囊
C. 道砟窝
D. 道砟坑
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答案
D
解析
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根据隧道的断面形式分:有矩形、拱形、圆形、多圆形及椭圆形等多种,但其中最主要的是( )两种。 ___
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