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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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