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
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相关考题
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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?（）.
A.Relative
B.TRUE
C.Compass
D.Magnetic -
单项选择题
Compass deviation is caused by（）.
A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing -
单项选择题
Compass error is equal to the（）.
A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
