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單項(xiàng)選擇題

The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.

A.magnetron
B.receiver
C.indicator
D.modulator

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單項(xiàng)選擇題

The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.

A.transmitter
B.antenna system
C.indicator
D.modulator

單項(xiàng)選擇題

The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.

A.persistence
B.pulse repetition rate
C.pulse length
D.resolution

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