______ is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature．A.MIXING FOGB.ADVECTION FOGC.RADIATION FOGD.ARCTIC SEA SMOKE
______ is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature．
A.MIXING FOG
B.ADVECTION FOG
C.RADIATION FOG
D.ARCTIC SEA SMOKE
相关考题：
Steam smoke will occur when ______.A.extremely cold air from shore passes over warmer waterB.warm dry air from shore passes over cooler waterC.cold ocean water evaporates into warm airD.cool rain passes through a warm air mass
The fog most commonly encountered at sea is called ______.A.conduction fogB.radiation fogC.frontal fogD.advection fog
Advection fog may be formed by cold air passing over a ______.A.colder sea surfaceB.warmer sea surfaceC.dry coastal plainsD.high mountain or plateau
When hugging a bank in a narrow channel，you should take precautions against ______．A.Bank suction，squat and the effects of vessels passing close aboardB.Clogged sea chests，plugged sea strainers and overheated machineryC.Striking underwater obstructions close to the bankD.All of the above
Advection fog is most commonly caused by ______.A.air being warmed above the dew pointB.saturation of cold air by rainC.a rapid cooling of the air near the surface of the Earth at nightD.warm moist air being blown over a colder surface
Fog is likely to occur when there is little difference between the dew point and the ______.A.relative humidityB.air temperatureC.barometric pressureD.absolute humidity
共用题干第二篇Hurricane（咫风）KatrinaA hurricane is a fiercely powertul , rotating（旋转的）form of tropical storm that can be 124 to 1,240 miles in diameter. The term hurricane is derived from Hurican,the name of a native American storm god.Hurricanes are typical of a calm central region of low pressure between 12 to 60 miles in diameter,known as the eye.They occur in tropical regions. Over its lifetime,one of these storms can release as much energy as 10,000 nuclear bombs.The seed for hurricane formation is a cluster（聚集）of thunderstorms over warm tropical waters.Hurricanes can only form and be fed when the sea-surface temperature exceeds 27℃ and the surrounding atmosphere is calm.These requirements are metbetween June and November in the northern part of the world.Under these conditions, large quantities of water evaporate（蒸发）and condense（冷凝）into clouds and rain-releasing heat in the process.It is this heat energy,combined with the rotation of the Earth,that drives a hurricane.When the warm column of air from the sea surface first begins to rise,it causes an area of low pressure.This in turn creates wind as air is drawn into the area.This spinning wind drags up more moist air from the sea surface in a process that strengthens the storm.Cold air falls back to the ocean surface through the eye and on the outside of the storm.Initially,when wind speeds reach 23 miles per hour,these mild,wet and grey weather systems are known as depressions,or low air pressure.Hurricane Katrina formed in this way over the south-eastern Bahamas on 23 August 2005.Katrina has had a devastating impact on the Gulf Coast of the US,leaving a disaster zone of 90,000 square miles in its wake（尾迹）一almost the size of the UK. Thousands have been killed or injured and more than half a million people have become homeless in a humanitarian（人道主义的）crisis of a scale not seen in the US since the Great Depression.The cost of the damage may top $100 billion.When the warm air from the sea surface begins to rise,itA:creates an area of low pressure.B:supplies cold air to the eye of a hurricane.C:increases the sea-surface temperature.D:strengthens the rotation of the earth.
共用题干第二篇Hurricane（咫风）KatrinaA hurricane is a fiercely powertul , rotating（旋转的）form of tropical storm that can be 124 to 1,240 miles in diameter. The term hurricane is derived from Hurican,the name of a native American storm god.Hurricanes are typical of a calm central region of low pressure between 12 to 60 miles in diameter,known as the eye.They occur in tropical regions. Over its lifetime,one of these storms can release as much energy as 10,000 nuclear bombs.The seed for hurricane formation is a cluster（聚集）of thunderstorms over warm tropical waters.Hurricanes can only form and be fed when the sea-surface temperature exceeds 27℃ and the surrounding atmosphere is calm.These requirements are metbetween June and November in the northern part of the world.Under these conditions, large quantities of water evaporate（蒸发）and condense（冷凝）into clouds and rain-releasing heat in the process.It is this heat energy,combined with the rotation of the Earth,that drives a hurricane.When the warm column of air from the sea surface first begins to rise,it causes an area of low pressure.This in turn creates wind as air is drawn into the area.This spinning wind drags up more moist air from the sea surface in a process that strengthens the storm.Cold air falls back to the ocean surface through the eye and on the outside of the storm.Initially,when wind speeds reach 23 miles per hour,these mild,wet and grey weather systems are known as depressions,or low air pressure.Hurricane Katrina formed in this way over the south-eastern Bahamas on 23 August 2005.Katrina has had a devastating impact on the Gulf Coast of the US,leaving a disaster zone of 90,000 square miles in its wake（尾迹）一almost the size of the UK. Thousands have been killed or injured and more than half a million people have become homeless in a humanitarian（人道主义的）crisis of a scale not seen in the US since the Great Depression.The cost of the damage may top $100 billion.Which of the following is NOT a"requirement"for the formation of a hurricane?A:Calm surrounding atmosphere.B:High air pressure.C:Warm sea-surface temperature.D:A group of thunderstorms over warm tropical waters.
单选题What occurs when rising air cools the dew point?（）Aadvection fog formsBhumidity decreaseCwind increaseDCloud form
单选题When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.Aaimed at the source of the flamesBfogged above the equipmentCshot off a flat surface onto the flamesDused to shield against electrical shock
单选题When must a dry chemical fire extinguisher be recharged?（）AAfter each useBWhen the air temperature exceeds 90°FCEvery 6 monthsDEvery 12 months
单选题The type of fog that occurs on clear nights with very light breezes and forms when the earth cools rapidly by radiation is known as（）.ARadiation fogBFrontal fogCConvection fogDAdvection fog
单选题The fog most commonly encountered at sea is called（）.Aconduction fogBradiation fogCfrontal fogDadvection fog
单选题Advection fog may be formed by cold air passing over a（）.Acolder sea surfaceBwarmer sea surfaceCdry coastal plainsDhigh mountain or plateau
单选题Advection fog is most commonly caused by（）.Aair being warmed above the dew pointBsaturation of cold air by rainCa rapid cooling of the air near the surface of the Earth at nightDwarm moist air being blown over a colder surface
单选题The dew point of air is reached when the wet bulb temperature is （）.ATwice the dry bulb temperatureB10℃ above the dry bulb temperatureC5℃ above the dry bulb temperatureDEqual to the dry bulb temperature
问答题Practice 1 Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______ 2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body. 3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively. 4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you. 5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.[A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.[B] The second factor is the amount of water vapor in the air－the humidity.[C] Hot windy days are much more comfortable than hot still days.[D] This heat transfer occurs even if the environment is hotter than the body.[E] When air moves over the surface of water, the amount of evaporation is greatly increased.[F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.[G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.
单选题Fog forms when the air（）.Ais 50% water saturatedBis 90% water saturatedCtemperature is greater than the dew point temperatureDtemperature is equal to，or below the dew point temperature
单选题An emergence sea anchor may be constructed by type of extinguisher?（）.Aa boat bucketBan air tank filled with waterCan oar and canvas weighted downDAll of the above
单选题Small floes of rough，hummocky sea ice capable of damaging a vessel（）.Acan usually be detected by radar in a smooth sea at a range of 4 to 6 kilometersBare indistinguishable from sea return on the PPICare invisible to radar when covered with a thick layer of snowDare usually seen at night before they are close enough to provide a radar echo
单选题（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.AMIXING FOGBADVECTION FOGCRADIATION FOGDARCTIC SEA SMOKE
单选题Steam smoke will occur when（）.Aextremely cold air from shore passes over warmer waterBwarm dry air from shore passes over cooler waterCcold ocean water evaporates into warm airDcool rain passes through a warm air mass
单选题Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）AOpen the machine on both ends so as to allow the air and dust to escapeBBe certain that the circuit breaker is opened and tagged on the feeder panelCBe certain that the air is clean and as dry as possibleDAll of the above
单选题（）is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.AFRONTAL FOGBMIXING FOGCADVECTION FOGDRADIATION FOG
单选题When occurring a fire in the scavenge air box, the following measures should be taken except for（）Areducing speed to SLOW and asking bridge for permission to stopBstopping the fuel oil supplyCswitching-on the auxiliary blowersDputting the scavenge air box fire extinguishing equipment into function
单选题The fog produced by warm moist air passing over a cold surface is called（）.Aconduction fogBradiation fogCfrontal fogDadvection fog
单选题When compared to air temperature,which factor is most useful in predicting fog?（）AVapor pressureBDew pointCBarometric pressureDAbsolute humidity