单项选择题
A.20mm B.30mm C.40mm D.50mm
A.-5%，+5% B.-15%，+15% C.-10%，+5% D.-5%，+10%
A.0.1 B.0.2 C.0.3 D.0.4
A.10Ω B.15Ω C.20Ω D.30Ω
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