A.負(fù)相關(guān) B.正相關(guān) C.無關(guān) D.以上說法都不對(duì)
A.50 B.25.1035 C.31.1035 D.28.35
A.2元/千克,0.011元/千克 B.2元/干克,0.09元/千克 C.1.8元/千克,0.011元/千克 D.1.8元/千克,0.09元/千克