A.0.1m/s B.0.2m/s C.0.3m/s D.0.4m/s
A.12m B.15m C.16m D.18m
A.與乘客行進(jìn)方向一致 B.與乘客行進(jìn)方向相反 C.與乘客行進(jìn)方向無關(guān)