单项选择题
A.105 B.130 C.155 D.180
A.Cosφ=P1/S B.Cosφ=P2/S C.Cosφ=ΔP/S D.Cosφ=1.732P/S
A.75~92% B.50~80% C.68~98% D.85~100%
A.2000 B.3000 C.4000 D.5000
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