单项选择题
A.30mA B.40mA C.50mA D.60mA
A.50Ω B.100Ω C.125Ω D.150Ω
A.DC3V B.DC4V C.DC5V D.DC6V
A.DC47/DC5V B.DC48/DC5V C.DC49/DC5V D.DC50/DC5V
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