单项选择题
A.100mm B.120mm C.140mm D.150mm
A.8mm B.9mm C.10mm D.12mm
A.3.5m B.4m C.4.5m D.5m
A.关闭档位或最大电压档 B.常用档位 C.最大电流档 D.最大电阻档
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