单选题A katabatic wind blows().Aup an incline due to surface heatingBin a circular patternCdown an incline due to cooling of the airDhorizontally between a high and a low pressure area

单选题
A katabatic wind blows().
A

up an incline due to surface heating

B

in a circular pattern

C

down an incline due to cooling of the air

D

horizontally between a high and a low pressure area


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BHave you ever wondered?1.Why do airplanes take longer to fly west than east?It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon know as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes movement a constams air speed thus go faster in the west-east direction when the air moving with the wind than in the opposite direction.2 What would happen if the gravity on Earth was suddenly turned off?Supposing we could magically turn off gravity. Would buildings and other structures float away? What happened would depend on how strongly the things were attached to the Earth. The Earth is moving at quite a speed moving at over a thousand miles per hour. If you turn something round your head on a string, it goes around in a circle until you let go of the strong go of the string. Things not attacked to the Earth would fly off in a straight line . People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things would fly off into space.60.What information coa we get from the first passage?A.tis the iet stoomn that affeets how fast airplanes fly.B.Planes go slower when they are moving with the wind.C.It takes more time to fly from NY to London than from London to NY.D.The jet stream always blows from the east to the west across the Atantic.

SHIFT OF WIND DIRECTION IN AN ANTICLOCKWISE MANNER, FOR EXAMPLE FROM NORTH TO WEST ( OPPOSITE OF VEERING ) defines ______.A.Backing (of wind)B.Veering (of wind)C.Shifting of windD.altering of wind

The numeral in the center of a wind rose circle on a pilot chart indicates the ______.A.total number of observationsB.average wind force on the Beaufort scaleC.average wind force in knotsD.percentage of calms

A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind ______.A.comes over the bowB.blows the fire back toward the vesselC.comes over the sternD.comes over either beam

When recording the wind direction in the weather log,you would report the ______.A.direction the wind is blowing towardB.direction the wind is blowing fromC.duration of the maximum gust of windD.wind chill factor

The velocity of the apparent wind can be more than the true wind,and come from the same direction,if certain conditions are present.One condition is that the ______.A.Ship's speed must be less than the true wind velocityB.True wind must be from dead asternC.True wind velocity must be faster than the ship's speedD.True wind must be from dead ahead

A wind vane on a moving vessel shows ______.A.dead reckoning wind directionB.true wind directionC.apparent wind directionD.estimated wind direction

An anemometer on a moving vessel measures ______.A.apparent wind speed onlyB.true wind speed and true wind directionC.true wind speed onlyD.apparent wind speed and true wind direction

单选题When evacuating a seaman by helicopter lift,the vessel should be().Astopped with the wind dead aheadBstopped with the wind on the beamCunderway with the wind 30°on the bowDunderway on a course to provide no apparent wind

单选题The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ().Aseawater contaminationBfrequent surface blowsCdissolved oxygen deaerationDfrequent bottom blows

单选题When recording the wind direction in the weather log,you would report the().Adirection the wind is blowing towardBdirection the wind is blowing fromCduration of the maximum gust of windDwind chill factor

单选题There is a fire aft aboard your vessel. To help fight the fire,you should().Aput the wind off either beamBhead the bow into the wind and decrease speedCput the stern into the wind and increase speedDput the stern into the wind and decrease speed

单选题The largest waves (heaviest chop) will usually develop where the wind blows().Aat right angles to the flow of the currentBagainst the flow of the currentCin the same direction as the flow of the currentDover slack water

单选题An instrument that indicates wind direction is known as a(n)().Aweather vane,wind vane or wind sockBhydrometerChygrometerDsling psychrometer

单选题A sea breeze is a wind().Athat blows towards the sea at nightBthat blows towards an island during the dayCcaused by cold air descending a coastal inclineDcaused by the distant approach of a hurricane

单选题When a wind is permanently changing the direction from which it blows, it is().AvariableBchangingCbackingDveering

单选题In summer, monsoon over the South China Sea blows from().AnortheastBsouthwestCsoutheastDnorthwest

单选题Most of your vessel’s superstructure is forward. How will the vessel lie when drifting with no way on?().AWith the wind from aheadBWith the wind off the port beamCWith the wind off the starboard beamDWith the wind from abaft the beam

单选题You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere.What action should you take to avoid the storm().APlace the wind on the starboard quarter and hold that courseBPlace the wind on the port quarter and hold that courseCPlace the wind on the port bow and hold that courseDPlace the wind on the starboard bow and hold that course

单选题When picking up your mooring at the buoy,the correct method is to().Aapproach the buoy with the wind and current asternBapproach the buoy with the wind and current aheadCapproach the buoy with wind and sea abeamDstop upwind and up current and drift down on the buoy

单选题An anemometer on a moving vessel measures().Aapparent wind speed onlyBtrue wind speed and true wind directionCtrue wind speed onlyDapparent wind speed and true wind direction

单选题When you walk in a busy street, you should walk on the side _____.Awhere the wind is comingBwhere the wind is goingCwhere the wind is weakerDwhere the wind is stronger

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单选题In the Northern Hemisphere,a wind that shifts counterclockwise is a().Aveering windBbacking windCreverse windDchinook wind

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单选题In the Northern Hemisphere,the right half of the storm is known as the dangerous semicircle because().Athe wind speed is greater here since the wind is traveling in the same general direction as the storm's trackBthe direction of the wind and seas might carry a vessel into the path of the stormCthe seas are higher because of greater wind speedDAll of the above