A.≤0.9g/kg B.≤0.7g/kg C.≤0.5g/kg D.≤0.3g/kg
A.≤750g/L B.≤700g/L C.≤650g/L D.≤600g/L
A.≤8g/kg B.≤7g/kg C.≤6g/kg D.≤5g/kg