A.0.3~0.6 B.0.6~0.9 C.0.9~1.2 D.1.2~1.5
A.1:2 B.1:3.5 C.1:5 D.1:6
A.提高鎂進(jìn)料量 B.加大回流 C.提高酸進(jìn)料量 D.提高配料比