单项选择题
A.110±3.3V B.110±6.6V C.220±3.3V D.220±6.6V
A.1/2 B.1/3 C.1/4 D.1/5
A.0.1Ω B.0.3Ω C.0.5Ω D.0.7Ω
A.1/2 B.2/3 C.3/4 D.4/5
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