单项选择题
A.0.5~0.7mm B.1.0~1.2mm C.1.5~1.7mm
A.0.5~1.5Ω B.5~7Ω C.10~11Ω
A.10000Km B.20000Km C.30000Km
A.1个 B.2个 C.4个
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