A.21.5~22.5m/s B.16.5~17.5m/s C.14.5~15.5m/s D.10~11m/s A.21.5~22.5m/s B.16.5~17.5m/s C.14.5~15.5m/s D.10~11m/s 分类:公用设备师 题型:选择题 查看答案