单项选择题
A.1.1mm B.1.2mm C.1.3mm D.1.35mm
A.0.5mm B.0.6mm C.0.7mm D.0.8mm
A.7mm B.7.5mm C.8mm D.9mm
A.电压 B.电流 C.电磁力 D.永磁力
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