单项选择题
A.1756082500 B.1790090500 C.1800097600 D.1825098200
A.3050 B.2980 C.3180 D.3110
A.3000元/吨,3200元/吨 B.2950元/吨,3150元/吨 C.3000元/吨,3160元/吨 D.2950元/吨,3120元/吨