边坡工程的勘探孔深度应穿过潜在滑动面并深入稳定层（）。
A.1～3m
B.2～5m
C.3～8m
D.5～10m
参考答案：B
This is the way________I have thought of to solve the problem.
A．how
B．that
C．in which
D．in that
极限可逆式转向器
