单项选择题
A.1倍 B.2倍 C.1~2倍 D.1.5~2倍
A.≥90% B.≥91% C.≥92% D.≥93%
A.97% B.98% C.99% D.100%
A.≤0.2% B.≤0.3% C.≤0.4% D.≤0.5%
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