单项选择题X 纠错
A.50mm B.200mm C.500mm D.1000mm
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单项选择题
A.10mm B.25mm C.36mm D.45mm
A.3500mm B.4500mm C.5000mm D.5300mm
A.密度 B.电阻率 C.横截面积 D.导线长度
A.500mm B.1000mm C.1500mm D.2000mm
A.50mm B.100mm C.150mm D.200mm
A.lmm B.1.5mm C.2mm D.2.5Inm
A.错误 B.正常 C.4mm D.10mm
A.1mm B.2mm C.3mm D.4mm
A.2mm B.4mm C.6mm D.8mm
A.4mm B.5mm C.6mm D.10mm
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