单项选择题
A.transmitter B.antenna system C.indicator D.modulator
The transmission time duration of a single pulse of rad...
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
You are using a radar in which your own ship is shown a...
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
Compass deviation is caused by（）.A.magnetism from the e...
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
