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單項選擇題

The number of pulses of energy transmitted per second is call the（）.

A.carrier frequency
B.pulse repetition rate
C.pulse length
D.pulse repetition time

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單項選擇題

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

單項選擇題

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

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