A.1000m≥L≥500m B.1000m≥L>500m C.1000m>L≥500m D.1000m>L>500m
A.3000m≥L≥1000m B.3000m≥L>1000m C.3000m>L≥1000m D.3000m>L>1000m
A.L≥3000m B.L>3000m C.L≥2500 D.L>2500