单项选择题
A.60% B.70% C.80% D.90%
A.2-3 B.0.5-1.5 C.1.5-2.5 D.1-2
A.≤4% B.≤5% C.≤6% D.≤7%
A.≤900 B.≤1000 C.≤1100 D.≤1200
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