单项选择题
A.600mm B.800mm C.1000mm D.无要求
A.1m B.1.2m C.1.5m D.2m
A.800mm B.单车长+800mm C.1000mm D.单车长+1200mm
A.降低土的压缩性 B.降低土的透水性 C.提高地基抗剪强度 D.提高地基土抗液化能力
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