单项选择题
A.±5% B.大于80% C.大于85% D.大于90%
A.≤1S B.≤1.5S C.≤2S D.≤2.5S
A.2.0-2.8S B.2.1-2.7S C.2.3-2.8S D.2.2-2.7S
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