单项选择题
A.10mm B.20mm C.30mm D.40mm
A.1.26Ω B.1.36Ω C.1.46Ω D.1.56Ω
A.2.2Ω B.2.3Ω C.2.4Ω D.2.5Ω
A.3mm～5mm B.5mm～8mm C.6mm～10mm D.8mm～10mm
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