单项选择题
A.10mm B.20mm C.30mm D.40mm
A.89米 B.90米 C.94米 D.100米
A.0.25 B.0.5 C.2 D.4
A.10.2Ω/100m B.13.2Ω/100m C.17.2Ω/100m D.19.2Ω/100m
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