单项选择题
A.33.3mV B.42mV C.110mV D.240mV
A.2.2Ω/1.1Ω B.4.4Ω/1.1Ω C.2.2Ω/0.9Ω D.4.4Ω/0.9Ω
A.1:18.3/1:40 B.1:13.89/1:40 C.1:13.89/1:50 D.1:18.3/1:50