单项选择题
A.电阻 B.电容 C.电流 D.电压
A.1.0~1.15 B.1.15~1.25 C.1.25~1.5 D.1.5~1.75
A.0.5~1.5s B.1.5~5s C.5~10s D.10~15s
A.0.5s B.5s C.10s D.15s
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