单项选择题
A.≥50% B.≥70% C.≥80% D.≥90%
A.4.0% B.5.0% C.6.0% D.8.0%
A.≥75.0% B.大于72.0%~75.0% C.大于68.0%~72.0% D.大于65.0%~68.0%