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1.	Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â is used when the optical emission results from the application of electric field.
A.	radiation
B.	efficiency
C.	electro-luminescence
D.	magnetron oscillator
Answer» D. magnetron oscillator

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