单项选择题
A.≤1% B.≤2% C.≤2.5% D.≤3% E.≤5%
A.≥70% B.≥75% C.≥80% D.≥85% E.≥90%
A.2袋 B.3袋 C.4袋 D.5袋 E.6袋
A.≥70% B.≥80% C.≥85% D.≥90% E.≥98%
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