A.persistenceB.pulse repetition rateC.pulse lengthD.rot……

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

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

单项选择题You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced?（）.

A.Relative
B.TRUE
C.Compass
D.Magnetic