on the same course as your vessel
at the same speed as your vessel
on the same course and speed as your vessel
on a reciprocal course at the same speed as your vessel
第1题：
The closest point of approach ( CPA ) of a contact on a relative motion radar may be determined ______.
A.immediately when the contact is noted on radar
B.only if the radar scope is watched constantly
C.after the contact has been marked at least twice
D.by an occasional glance at the radar
第2题：
The field coils ______ and the armature(电枢) ______. This is in fact the arrangement adopted for large, heavy duty alternators.
A.are stationary(固定的)/rotates
B.are stationary/is stationary
C.rotate/ is stationary
D.rotate/rotate
第3题：
According to the passage which of the following is true?
[A] A fixed star refers a star that is always stationary on the sky.
[B] Scientists can tell the motion of the earth from the motions of other five planets.
[C] Ancient people had scanty knowledge about the movement of the stars.
[D] All the stars on the sky can be seen all the year around.
第4题：
When the relative motion display is selected all tracked objects will display ______ vectors．
A.motion
B.stationary
C.dynamical
D.flashing
第5题：
The description Racon beside an illustration on a chart would mean a ______.
A.radar conspicuous beacon
B.circular radiobeacon
C.radar transponder beacon
D.radar calibration beacon
第6题：
The field coils _____and the armature _____. This is in fact the arrangement adopted for large, heavy duty alternators.
A.are stationary / rotates
B.are stationary /is stationary
C.rotate / is stationary
D.rotate / rotates
第7题：
My radar is not working．I require shorebased radar assistance．Is shorebased radar assistance ________ ？
A.used
B.available
C.in use
D.can be used
第8题：
Radar display in which North is always at the top of the screen is a(n)______．
A.unstabilized display
B.stabilized display
C.composition display
D.relative display
第9题：
A pattern that at the crest the motion of each particle is forward and at the trough it is backward relative to the wave's motion is ______．
A.a trochoid
B.a spheroid
C.a loxodrome
D.a carene
第10题：
You have another ship overtaking you close aboard to starboard．You have 3 radar targets bearing 090° relative at ranges of 0.5 mile，1 mile，and 1.5 miles．In this case，the unwanted echoes are called ______．
A.Multiple echoes
B.Spoking
C.Indirect echoes
D.Side-lobe echoes