在确保工人施工安全的前提下,可以选用人工挖孔桩方法,孔径在1200~2000mm;但挖孔深度不宜超过()。A.15m B.20m C.25m ...

作者: rantiku 人气: - 评论: 0
问题 在确保工人施工安全的前提下,可以选用人工挖孔桩方法,孔径在1200~2000mm;但挖孔深度不宜超过()。
选项 A.15m B.20m C.25m D.30m
答案 C
解析

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