A.1.9×10-4mol/L B.3.0×10-4mol/L C.2.0×10-4mol/L D.5.2×10-4mol/L
A.0.1~0.2g B.0.2~0.4g C.0.4~0.8g D.1~2g
A.0.25g左右 B.1g左右 C.0.1g左右 D.0.5g左右