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
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A.persistence
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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?（）.
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