单项选择题
A.1mΩ B.2mΩ C.3mΩ D.4mΩ
A.10% B.15% C.20% D.30%
A.直流参考电压 B.额定电压 C.标称电压 D.最大持续工作电压
A.5s B.10s C.15s D.20s
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