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Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to ______.
A.the effects of beam width
B.limitations on range resolution
C.the pulse length of the radar
D.the multiple-target resolution factor
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更多 “ Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to ______.A.the effects of beam widthB.limitations on range resolutionC.the pulse length of the radarD.the multiple-target resolution factor ” 相关考题
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共用题干
Caribbean IslandsWhat would you see if you took a cruise to the Caribbean Islands?Palm trees and coconuts（椰子）?White beaches and clear, blue ocean? Colorful corals（珊瑚）and even more colorful fishes and birds?You bet.There are thousands of islands in the Caribbean Sea.They are famous for their warm,tropical climate and great natural beauty.The Caribbean Islands form a chain that separates the Caribbean Sea from the rest of the Atlantic Ocean._________(1)Many of the islands were formed by the eruption （爆发）of ancient volcanoes（火山）.Others are low-lying coral islands that gradually rose from the ocean.The Caribbean Islands are known by several names._________(2)The explorer Christopher Columbus called the islands the Indies in 1492 because he thought he was near the coast of India.Later,Spain and France called the islands the Antilles.There are four large islands in the Caribbean Sea._________(3)These four islands are often called the Greater Antilles.Together,they account for about 90 per cent of the land area of the Caribbean lslands.The rest of the Caribbean Islands are much smaller._________(4)You can see why pirates such as the famous Blackbeard sailed these waters.There are countless small islands to bury treasure or hide on.The weather of the Caribbean Sea is almost always warm and sunny.Sandy beaches line the coasts of many islands._________(5)Many tourists arrive on cruise ships._________（3）A:But life on the Caribbean Islands is not always paradise.B:The earliest name used by Europeans is the Indies,later changed to the West Indies.C:They're like a long necklace that stretches between North and South America.D:They are Cuba,Puerto Rico,Jamaica,and Hispaniola.E:This is why millions of tourists visit the islands each year.F:Some of these islands are no more than tiny slivers（小片）of exposed coral.
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The line leading at right angles to the （）(中线) from the forecastle to the shore is called the forward breast line.A、draftB、waterlineC、centerlineD、abeam
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单选题A mooring line leading at nearly right angles to the keel is a（）.A
bow lineB
breast lineC
spring lineD
stern line
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单选题You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.A
stop your enginesB
sound two prolonged blasts of the whistleC
sound the danger signalD
slow to bare steerageway
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单选题You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.A
Reduce speed to bare steeragewayB
Stop your enginesC
Begin a radar plotD
All of the above
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单选题The 10-cm radar as compared to a 3-cm radar of similar specifications will（）.A
be more suitable for river and harbor navigationB
provide better range performance on low lying targets during good weather and calm seasC
have a wider horizontal beam widthD
have more sea return during rough sea conditions
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单选题A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.A
dikeB
revetmentC
cutoffD
crib
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单选题Mariners are reminded that they should proceed in the general direction indicated by the arrows or，if（）a lane，they should do so as nearly as practicable at right angles to it.A
crossB
crossingC
crossedD
crosses
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单选题It may be found that，in certain circumstances，radar beacon emissions can cause（）with the normal radar display，particularly at close range.A
unwanted interferenceB
unexpected figuresC
abnormal dataD
unwanted information
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单选题A navigator fixing a vessel’s position by radar （）.A
can use radar information from one object to fix the positionB
should never use radar bearingsC
should only use radar bearings when the range exceeds the distance to the horizonD
must use information from targets forward of the beam
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单选题Which one of the following is a counterexample to the statement “If two angles are supplementary, then they are right angles?”A
If two angles are complementary, then they are not right angles.B
If two angles are fight angles, then they are supplementary.C
If two angles are not supplementary, then they are not right angles.D
If two angles are supplementary, then one could measure 100° and one could measure 80°.E
If two angles are not fight angles, then they are not supplementary.
考题
单选题Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to （）.A
the effects of beam widthB
limitations on range resolutionC
the pulse length of the radarD
the multiple-target resolution factor
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单选题Which statement concerning the operation of radar in fog is TRUE?（）A
Radar ranges are less accurate in fogB
Navigation buoys will always show up on radarC
A sandy beach will show up clearer on radar than a rocky cliffD
Small wooden boats may not show up on radar
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单选题Flexible hose under pressure in a hydraulic system will （）.A
tend to twist about its long axisB
expand in length and in diameterC
contract in length and expand in diameterD
flex at right angles to the applied pressure
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单选题In any right triangle, the acute angles are ______.A
EqualB
Adjacent anglesC
Vertical anglesD
Complementary anglesE
Supplementary angles
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单选题Which statement concerning maneuvering in restricted visibility is FALSE?（）.A
A vessel which cannot avoid a close-quarters situation with a vessel forward of her beam shall reduce her speed to bare steeragewayB
A vessel which hears a fog signal forward of her beam shall stop her enginesC
A vessel which hears a fog signal forward of the beam shall navigate with cautionD
If a vessel determines by radar that a close-quarters situation is developing，she shall take avoiding action in ample time
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单选题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 radarB
only if the radar scope is watched constantlyC
after the contact has been marked at least twiceD
by an occasional glance at the radar
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单选题The distance a vessel moves at right angles to the original course，when a turn of 180°has been completed，is called the（）.A
advanceB
pivoting pointC
tactical diameterD
kick
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