单项选择题
A.6 B.7 C.8 D.9 E.10
A.50% B.90% C.80% D.70% E.30%
A.A+1.80S≤15.0 B.A+1.80S>15.0 C.A+1.45S>15.0 D.A+S>15.0 E.A+S>15.0
A.±7.5% B.±5.0% C.±0.5% D.7.5% E.5.0%
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