單項(xiàng)選擇題臨近設(shè)計(jì)高程時(shí),應(yīng)預(yù)留保護(hù)層暫不開挖的范圍是()。

A.0.1-0.2m
B.0.2-0.3m
C.0.3-0.4m
D.0.4-0.5m