立井井筒表土段施工为冻结法施工时，其冻结深度应穿过风化带延深至稳定的基岩（）以上。A. 8m B. 10m C. 15m D. 20m

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问题立井井筒表土段施工为冻结法施工时，其冻结深度应穿过风化带延深至稳定的基岩（）以上。

选项 A. 8m B. 10m C. 15m D. 20m

答案 B

解析

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