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
Steam smoke will occur when ______.
A.extremely cold air from shore passes over warmer water
B.warm dry air from shore passes over cooler water
C.cold ocean water evaporates into warm air
D.cool rain passes through a warm air mass
相关考题：
When satisfied that there are no contagious diseases on board，the quarantine officer will issue ______.A.an outward clearanceB.a free pratiqueC.landing permitsD.shore passes
Neap tides occur ______.A.at the start of spring, when the Sun is nearly over the equatorB.only when the Sun and Moon are on the same sides of the Earth and are nearly in lineC.when the Sun and Moon are at approximately 90°to each other, as seen from the EarthD.when the Sun , Moon, and Earth are nearly in line, regardless of alignment order
Hygroscopic cargoes should be ventilated when ______.A.going from a warm to a cold climateB.the dew point of the outside air is greater than the dew point of the air in the holdC.the dew point of the air in the hold is very lowD.the outside dew point is 16°C and the cargo temperature is 12°C
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
______ 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
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
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.
Many people use wood stoves and fireplaces to heat their homes．Scientists have become worried about the smoke that they give off．Harmful chemicals are in the smoke．The smoke is causing air pollution．The pieces of pollution,called soot,are floating in the air．They are too tiny to see．Scientists must use a microscope to see them. Small amounts of soot are safe,but large amounts can be dangerous．The govenment wants to limit this kind of pollution．It may stop people from using their fireplaces. The air is tested every day．When soot levels are high,more than 65 micrograms of soot per cubic meter,factories must stop making smoke．The government thinks that limit should be much lower.Factories produce the most smoke and soot．But the government thinks that all types of burning should be limited．The soot levels from factories and homes could be limited．Home owners may have to install new wood stoves that they comply with the new law．Or,they may not be able to bum on days when the air quality is bad. Residents of some towns are fined if they violate the burning ban．Scientists hope these new regulations will make the air cleaner and less harmful to breathe.What happens to some residents who bum too much wood?A.They could lose their homeB.They pay for the punishmenC.They get sick from the smokD.The fire could get out of contro
Many people use wood stoves and fireplaces to heat their homes．Scientists have become worried about the smoke that they give off．Harmful chemicals are in the smoke．The smoke is causing air pollution．The pieces of pollution,called soot,are floating in the air．They are too tiny to see．Scientists must use a microscope to see them. Small amounts of soot are safe,but large amounts can be dangerous．The govenment wants to limit this kind of pollution．It may stop people from using their fireplaces. The air is tested every day．When soot levels are high,more than 65 micrograms of soot per cubic meter,factories must stop making smoke．The government thinks that limit should be much lower.Factories produce the most smoke and soot．But the government thinks that all types of burning should be limited．The soot levels from factories and homes could be limited．Home owners may have to install new wood stoves that they comply with the new law．Or,they may not be able to bum on days when the air quality is bad. Residents of some towns are fined if they violate the burning ban．Scientists hope these new regulations will make the air cleaner and less harmful to breathe.Why is it dangerous to burn too much wood?A.The fire could burn yoB.It's not healthy to be too warC.Harmful chemicals are released in the soD.The smoke is filled with un see able tiny piece
单选题Neap tides occur（）.AAt the start of spring，when the Sun is nearly over the equatorBOnly when the Sun and Moon are on the same sides of the Earth and are nearly in lineCWhen the Sun and Moon are at approximately 90° to each other，as seen from the EarthDWhen the Sun，Moon，and Earth are nearly in line，regardless of alignment order
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In many areas atoll clouds (clouds of vertical development) are produced over small islands. These are the result of（）.Arising air currents produced by the warm islandsBwarm air from the sea rising over higher land areasCcool land air mixing with warm sea airDdescending air over the islands
单选题As the air passes through the charge air cooler, its temperature may be reduced and moisture condensed, with the condensate in danger of being carried into the engineSo a water separator should be mounted beneath the bottom part of the engine inlet manifoldA water separator is used in order to （）.Akeep the air from being carried into the engineBkeep the moisture from being condensedCkeep the danger from being carded into the engineDtake away the condensate from the air
单选题A frontal thunderstorm is caused by（）.Apronounced local heatingBwind being pushed up a mountainCa warm air mass rising over a cold air massDan increased lapse rate caused by advection of warm surface air
单选题Spring tides occur（）.Aat the start of spring，when the Sun is nearly over the equatorBonly when the Sun and Moon are on the same side of the Earth and nearly in lineCwhen the Sun and Moon are at approximately 90°to each other as seen from the EarthDwhen the Sun，Moon，and Earth are nearly in line，in any order
单选题What is NOT a function of the air supply of a covered lifeboat?（）AProvides air for engine combustionBPressurizes water spray systemCProvides air for passenger respirationDPrevents smoke and other noxious fumes from entering craft
单选题Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）AA room thermostat activates an electric heater at each individual chilled air outlet when necessaryBVarying the number of passes the air makes across the coilsCVarying the temperature of the water through the coilsDVarying the quantity of water flowing through the coils
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When evacuating a seaman by helicopter lift，which course should the ship take?（）ADownwind so that the apparent wind is close to nilBA course that will keep a free flow of air，clear of smoke，over the hoist areaCA course that will have the hoist area in the lee of the superstructureDWith the wind dead ahead because the helicopter is more maneuverable when going into the wind
单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.Acheck and regulate the water levelBclose the air cock once fires are litCblowdown the gage glassDcrack the steam stop to assure protective steam flow
单选题Hygroscopic cargoes should be ventilated when（）.Agoing from a warm to a cold climateBthe dew point of the outside air is greater than the dew point of the air in the holdCthe dew point of the air in the hold is very lowDthe outside dew point is 16°C and the cargo temperature is 12°C
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）AThe diesel oil must never be allowed to mix with the heavy fuelBThe temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveCThe heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveDThe heating steam must be secured before the diesel oil passes through the three-way valve
单选题Hygroscopic cargoes should be ventilated when（）.Agoing from a warm to a cold climateBthe dew point of the outside air is greater than the dew point of the air in the holdCthe dew point of the air in the hold is very lowDthe outside dew point is 16℃ and the cargo temperature is 12℃
单选题A space should be ventilated when（）.AThe cargo's temperature is colder than the dew point of the air in the spaceBThe cargo's temperature is warmer than the dew point of the air in the spaceCThe dew point of the air in the space is lower than the dew point of the outside airDAll of the above
单选题The fog produced by warm moist air passing over a cold surface is called（）.Aconduction fogBradiation fogCfrontal fogDadvection fog