单项选择题
A.20mm B.25mm C.30mm D.45mm
A.1级 B.1.5级 C.2级 D.2.5级
A.5mm~20mm B.10mm~30mm C.20mm~50mm D.20mm~60mm
A.10Ω B.12Ω C.14Ω D.16Ω
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