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The speed of radio waves is equal to ________of light.
A. those
B. that
C. the one
D. the ones
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The bearing of tailshaft sealing equipment which adopts the oil nature circulation is hot, the reason isA.the rotate speed fluctuationB.the ventilation tube cloggedC.the main engine accelerate so fastD.stormy waves
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An aneroid barometer is an instrument ______.A.used to measure the speed of windB.in which the pressure of air is measuredC.that tells which direction a storm is coming fromD.used to measure the height of waves
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The vacuum tube,invented near the beginning of our century,gave us the use of radio waves,an energy source never before（ ）,and later opened the road for television.A.was captured
B.captured
C.capturing
D.has been captured
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单选题（）is a radio receiver with ablity to sense direction of the incoming radio waves.A
The echo sounderB
The radarC
The course recorderD
The direction finder
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单选题The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）A
the rotate speed fluctuationB
the ventilation tube cloggedC
the main engine accelerate so fastD
stormy waves
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单选题An aneroid barometer is an instrument（）.A
used to measure the speed of windB
in which the pressure of the air is measuredC
that tells which direction a storm is coming fromD
used to measure the height of waves
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单选题The apparent wind can be zero when the true wind is from（）.A
ahead and equal to the ship's speedB
astern and equal to the ship's speedC
ahead and equal to twice the ship's speedD
astern and equal to twice the ship's speed
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单选题The spur geared mooring winches have advantages over worm geared ones in（）A
higher efficiency of the gear train while reversingB
the higher gear ratioC
the multi-start featureD
higher recovering speed
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单选题Important changes to charts and lights（including temporary ones），radio signals and sailing directions are listed in（）.A
Weekly Admiralty Notices to MarinersB
The Mariners HandbookC
Ocean Passages for the WorldD
Symbols and Abbreviations used on Admiralty Charts，Chart 5011
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单选题When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.A
pick up more of any increase in loadB
pick up less of any increase in loadC
share an equal amount of any increase in loadD
drop an equal amount of any decrease in load
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单选题The flywheel reduces speed fluctuations by （）A
maintaining a constant rack settingB
storing kinetic energyC
maintaining equal exhaust pressureD
maintaining even camshaft speed
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单选题A RADIO SIGNAL FROM A DISTRESSED VESSEL AUTOMATICALLY DIRECTED TO A RCC GIVING POSITION，IDENTIFICATION，COURSE AND SPEED OF THE VESSEL AS WELL AS THE NATURE OF DISTRESS is known as（）.A
Distress alertB
Safety alertC
Emergency alertD
General alert
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单选题The radio waves used for radar are very short，only（）long.A
a few centimetersB
a few fathomsC
a few metersD
a few feet
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单选题The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.A
on loran charts covering areas where sky waves are usedB
in the Radio Aids to Navigation，PUB 117C
in the Loran-C Correction TablesD
Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
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单选题（） thrust and resistance equal each other, the ship always travels at a constant speed.A
As long asB
As far asC
As well asD
Unless
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单选题An electronic depth finder operates on the principle that（）.A
radio signals reflect from a solid surfaceB
sound waves travel at a constant speed through waterC
radar signals travel at a constant speed through waterD
pressure increases with depth
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单选题Some radio waves（）the surface of the earth because of its（）.A
are capable of following / distanceB
can follow / altitudeC
can hardly follow / shapeD
are unable following / angle
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