Television is a kind of __________.
A. transmitter
B. receiver
C. transceiver
D. impulse
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The three primary colour of TV are ___________.
A. red,blue and yellow
B. red,green and white
C. red,greenand blue
D. yellow, magenta and cyan
After being amplified,________is fed to the loud speaker.
A. modulated frequency signal
B. demodulator
C. audio
D. FM detector
________strikes he tube, producing a bright spot on the front of phosphorescent.
A. Electron beam
B. heated cathode
C. anode
D. deflecting oil
双打比赛开始时，A发球给X，那第二局比赛开始时：
A. X发球A接
B. X和Y决定谁先发球，然后A和B决定谁接发球
C. X或者是Y都可以发球，但是必须是A接发球
D. X和Y决定谁先发球，然后将规定谁接发球
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