A.15mA B.≯15mA C.30mA D.≯30mA
A.4Ω B.10Ω C.15Ω D.30Ω
A.大于200mm和不小于100mm B.大于80mm和不小于50mm C.大于150mm和不小于100mm D.大于100mm和不小于50mm
A.2 B.3 C.4 D.5
A.800个 B.1000个 C.1500个 D.2000个
