单项选择题
A.-5%~+5% B.-7%~+7% C.-10%~+7% D.-7%~+10%
A.±2% B.±5% C.±7% D.±10%
A.5% B.10% C.15% D.20%
A.0.80 B.0.85 C.0.90 D.0.95
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