单项选择题
A.0.5mm B.2.5mm C.1.5mm D.2mm
A.0.5mm B.1.5mm C.2.5mm D.2mm
A.2.5mm B.1.5mm C.0.5mm D.2mm
A.≤0.5欧姆 B.≤1欧姆 C.≤4欧姆 D.≤5欧姆
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