單項選擇題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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1.單項選擇題（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.

A.Gain Control
B.Brilliant Control
C.Anti-clutter Sea Control
D.Sweep Intercept

2.單項選擇題（）is on the panel of radar.

A.KEYLOCK
B.REPEATER
C.STATIC INVERTER
D.ANTI-CLUTTER-SEA

3.單項選擇題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

4.單項選擇題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

5.單項選擇題How is variation indicated on a small-scale nautical chart?（）.

A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts

7.單項選擇題Deviation in a compass is caused by the（）.

A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel

8.單項選擇題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

9.單項選擇題（）the canal transit，the radar was operating.

A.At
B.In
C.During
D.With

10.單項選擇題A deadhead is a(n)（）.

A.tree or log awash in a nearly vertical position
B.crew member who refuses to work
C.upstream end of a land wall
D.buoy that is adrift