单项选择题
A.0.1%~0.5% B.0.3%~1% C.0.5%~1% D.0.8%~1%
A.20%,110% B.20%,100% C.50%,110% D.50%,100%
A.0%~50% B.50%~90% C.70%~100% D.70%~110%