单项选择题
A.1830和550 B.550和1830 C.1955和425 D.441和1939
A.轻货470t,重货610t B.轻货360t,重货720t C.轻货610t,重货470t D.轻货720t,重货360t
A.1300;1150 B.1350;1100 C.1400;1050 D.1450;1000