In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable

In selenium rectifiers efficiencies ranging from ______ to ______ perc

1.	In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
A.	25, 35
B.	40, 50
C.	60, 70
D.	75, 85
Answer» E.