A.1.15m/s~1.5m/s B.1.15m/s~1.25m/s C.1.25m/s~1.5m/s
A.2m/s~2.5m/s B.2.3m/s~2.625m/s C.2.5m/s~2.7m/s
A.脫離繩槽 B.生銹 C.被阻擋 D.打滑