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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 is a microwave device in which the frequency of operation is determined by the biasing field strength.
A.	vtm
B.	gyratron
C.	helix bwo
D.	none of the mentioned
Answer» C. helix bwo

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