A.0.990 B.0.995 C.0.999 D.0.9999
A.90%-110% B.75%-125% C.50%-150% D.95%-105%
A.10；10% B.10；5% C.20；10% D.20；20%
A.95%~105% B.90%~110% C.70%~120% D.50%~150%
A.苯 B.乙腈 C.二氯甲烷 D.正己烷
