【判断题】
A、i=n<sub>1sub>/n<sub>2sub> B、i=z<sub>1sub>/z<sub>2sub> C、i=d<sub>1sub>/d<sub>2sub>
A、i=ω<sub>1sub>/ω<sub>2sub> B、i=Z<sub>2sub>/Z<sub>1sub> C、i=n<sub>1sub>/n<sub>2sub> D、i=d<sub>2sub>/d<sub>1sub>
A、i=n<sub>1sub>/n<sub>2sub> B、i=d<sub>1sub>/d<sub>2sub> C、i=z<sub>1sub>/z<sub>2sub> D、i=T<sub>1sub>/ηT<sub>2sub>