單項(xiàng)選擇題Which of the following radar contacts will present the most immediate danger?（）.

A.A vessel on the starboard bow whose bearing is changing and range is decreasing
B.A vessel on the starboard bow whose bearing is steady and range is increasing
C.A vessel on the port bow whose bearing is steady and range is decreasing
D.A vessel on the port bow whose bearing is changing to the left and range decreasing


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2.單項(xiàng)選擇題Error may be introduced into a magnetic compass by（）.

A.making a structural change to the vessel
B.a short circuit near the compass
C.belt buckles
D.All of the above

3.單項(xiàng)選擇題The minimum range at which a target can be detected is basically determined by which of the following?（）.

A.persistence
B.pulse repetition rate
C.pulse length
D.rotation rate

4.單項(xiàng)選擇題A Doppler log in the bottom return mode indicates the（）.

A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground

5.單項(xiàng)選擇題Deviation is the angle between the（）.

A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian

8.單項(xiàng)選擇題An ECDIS is required to display which information?（）

A.Radar targets
B.ARPA vectors
C.Hydrographic data
D.All of the above

9.單項(xiàng)選擇題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

10.單項(xiàng)選擇題A radar contact will remain stationary on a relative motion radar display only when it is（）.

A.on the same course as your vessel
B.at the same speed as your vessel
C.on the same course and speed as your vessel
D.on a reciprocal course at the same speed as your vessel