A.0.3 B.1 C.0.7
A.8% B.12% C.15% D.16%
A.功率因數(shù)總是小于1 B.取決于負載的性質(zhì)和參數(shù) C.λ=cosψ D.提高負載與電源間無功功率的交換可以提高功率因數(shù)