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单选题
A warm air mass is characterized by（）.
A
stability
B
instability
C
gusty winds
D
good visibility
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Temperature and moisture characteristics are modified in a warm or cold air mass due to ______.A.pressure changes in the air massB.movement of the air massC.the heterogeneous nature of the air massD.upper level atmospheric changes
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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
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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
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A source of an air mass labeled mTw is ______.A.the equatorB.the Gulf of MexicoC.AlaskaD.Canada
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In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. These are the result of ______.A.rising air currents produced by the warm islandsB.warm air from the sea rising over higher land areasC.cool land air mixing with warm sea airD.descending air over the islands
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A frontal thunderstorm is caused by ______.A.pronounced local heatingB.wind being pushed up a mountainC.a warm air mass rising over a cold air massD.an increased lapse rate caused by advection of warm surface air
考题
A warm air mass is characterized by______．A.stabilityB.instabilityC.gusty windsD.good visibility
考题
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
考题
As the temperature for an air mass decreases, the ______.A.absolute humidity increasesB.relative humidity increasesC.specific humidity increasesD.dew point rises
考题
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week according to the National Weather Service.
According to the NWS a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
Temperatures across the Midwest will drop into the 60s and 70s-a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington
The cool breezes may be a welcome relief this time around but remember the last few times we got hit with Arctic air？
Temperatures in cities including Chicago Cleveland New York and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we’re sure you remember
According to the National Weather Service____A. the cool mass of air originates from Canada
B. a mass of cold air will affect both Canada and the U.S
C. the chilly weather is back to the globe
D. only the upper Midwest will be affected by the cool air
考题
资料：We never thought we'd say this, but we'd welcome back some chilly weather.
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week, according to the National Weather Service.
According to the NWS, a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
Temperatures across the Midwest will drop into the 60s and 70s—a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington.
The cool breezes may be a welcome relief this time around, but remember the last few times we got hit with Arctic air?
Temperatures in cities including Chicago, Cleveland, New York, and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we're sure you remember.
According to the National Weather Service, ___.A.the cool mass of air originates from Canada
B.a mass of cold air will affect both Canada and the U.S.
C.the chilly weather is back to the globe
D.only the upper Midwest will be affected by the cool air
考题
单选题When crossing a front,isobars tend to（）.A
change from smooth curves within the air mass to sharp bends at the frontB
change from sharp bends within the air mass to smooth curves at the frontC
pass smoothly across the front with no changeD
become closer together at the front and pass through in straight lines
考题
单选题Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.A
pressure changes in the air massB
movement of the air massC
the heterogeneous nature of the air massD
upper level atmospheric changes
考题
单选题In many areas atoll clouds (clouds of vertical development) are produced over small islands. These are the result of（）.A
rising air currents produced by the warm islandsB
warm air from the sea rising over higher land areasC
cool land air mixing with warm sea airD
descending air over the islands
考题
单选题A frontal thunderstorm is caused by（）.A
pronounced local heatingB
wind being pushed up a mountainC
a warm air mass rising over a cold air massD
an increased lapse rate caused by advection of warm surface air
考题
单选题Clouds form（）.A
as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small dropletsB
as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming cloudsC
dry air compresses moisture from the atmosphere into cloudsD
when the relative humidity of the atmosphere is low
考题
单选题An air mass is termed warm if（）.A
it is above 70°FB
the ground over which it moves is cooler than the airC
it originated in a high pressure areaD
it originated in a low pressure area
考题
单选题The first indications a mariner will have of the approach of a warm front will be （）.A
large cumulonimbus (thunderclouds) building upB
high cirrus clouds gradually changing to cirrostratus and then to altostratusC
fog caused by the warm air passing over the cooler waterD
low dark clouds accompanied by intermittent rain
考题
单选题Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.A
specific volumeB
densityC
viscosityD
calorific value
考题
单选题Hygroscopic cargoes should be ventilated when（）.A
going from a warm to a coldB
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
考题
单选题As the temperature of an air mass decreases，the（）.A
absolute humidity decreasesB
relative humidity increasesC
specific humidity decreasesD
dew point rises
考题
单选题The greater the pressure difference between a high and a low pressure center，the（）.A
dryer the air mass will beB
cooler the temperature will beC
greater the force of the wind will beD
warmer the temperature will be
考题
单选题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
考题
单选题As the temperature for a given mass of air increases，the（）.A
dew point increasesB
dew point decreasesC
relative humidity increasesD
relative humidity decreases
考题
单选题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
考题
单选题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℃ and the cargo temperature is 12℃
考题
单选题The fog produced by warm moist air passing over a cold surface is called（）.A
conduction fogB
radiation fogC
frontal fogD
advection fog
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