A.Ⅱ B.Ⅲ C.Ⅳ D.I
A.3~5m B.5~7m C.5~10m D.8~15m
A.梯段高度H B.超鉆深度L C.炮孔間距應(yīng)a和排距b D.底盤抵抗線Wp E.堵塞長(zhǎng)度L2