A.<0.01% B.≤0.01% C.<0.1% D.≤0.1%
A.≥0.8,≥0.8 B.≥0.75,≥0.8 C.≥0.8,≥0.75 D.≥0.75,≥0.75
A.6~8,12 B.6~8,13 C.8~10,12 D.8~10,13