某站进站信号机外制动距离内,进站方向有两段下坡道,分别为6.5 .200m和5.5 .600m,该制动距离内单位坡道阻力为( )

某站进站信号机外制动距离内,进站方向有两段下坡道,分别为6.5 .200m和5.5 .600m,该制动距离内单位坡道阻力为( )。[321010302]

A.-6.0N/kN

B.-5.9N/kN

C.-5.8N/kN

D.-5.75N/kN

正确答案是D