单项选择题
A.小于10 B.大于１ C.大于３ D.大于５
A.小于0.1mΩ B.不大于1mΩ C.小于0.1Ω D.小于1Ω
A.5m B.14.5m C.20m D.29m
A.10.3Hz B.11.4Hz C.13.6Hz D.26.8Hz
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