单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
