单项选择题
A.0~10mm B.5~15mm C.10~20mm D.15~25mm
A.30mm B.50mm C.80mm D.100mm
A.5Ω B.10Ω C.20Ω D.30Ω
A.0~10mm B.5~10mm C.0~20mm D.10~20mm
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