A.跳板B.臨時(shí)爬梯C.繩索D.專用梯道
A.10-20 B.20-30 C.30-40 D.40-50
A.0.1;0.1-0.2 B.0.2;0.3-0.4 C.0.3;0.3-0.4 D.0.4;0.1-0.2