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单选题
They know that strong winds, mild and humid air, and cold air near to each other might trigger a really explosive weather situation.
A
cause
B
imply
C
forecast
D
reduce
参考答案
参考解析
解析：
句意：他们知道强风、温和潮湿的空气和冷空气聚在一起会引发剧烈的天气变化。trigger引发，引起，触动。cause引起，导致。imply暗示。forecast预告。reduce减少。
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资料：We never thought we'd say this, but we'd welcome back some chilly weather.
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According to the NWS, a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
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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Advection fog is most commonly caused by（）.A
air being warmed above the dew pointB
saturation of cold air by rainC
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charge air receiverB
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单选题An electric heater built into some smaller diesel engines is used to （）.A
raise lube oil viscosity for easier starting in cold weatherB
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increase compression ratioD
increase jacket water temperature for easier starting in cold weather
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单选题When comparing the air with 50% of relative humidity with the air with 100% of relative humidity, which one will hold more water?（）A
the formerB
the latterC
not for sureD
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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
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单选题A （） in the air delivery line near to each compressor is essential.A
butterfly valveB
globe valveC
gate valveD
non-return valve
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单选题Cold weather starting of a diesel engine may be made easier by（）A
decreasing the compression ratioB
using a special fuel having a high ignition temperatureC
increasing the starting air supplyD
heating the jacket water
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单选题Cold weather starting of a diesel engine is more difficult than warm weather starting due to（）A
use of low viscosity oil in cold weatherB
increased moisture content of inlet air in cold weatherC
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higher compression pressures reached due to smaller clearances existing in the engine during cold weather
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单选题In extreme weather conditions, either hot or cold, control of the air conditioning plant presents （） difficulties.A
fewB
littleC
a littleD
less
考题
单选题Hot air can hold（）.A
less moisture than cold airB
more moisture than cold airC
the same amount of moisture as cold airD
moisture independent of air temperature
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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
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单选题On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）A
cooling jacketB
cylinder linerC
piston crownD
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单选题If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.A
control air systemB
forced draft air systemC
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ships service air system
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单选题Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to （）A
burn excessive amounts of lube oilB
overheat without smokingC
operate with reduce power or stopD
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单选题They know that strong winds, mild and humid air, and cold air near to each other might trigger a really explosive weather situation.A
cause B
imply C
forecast D
reduce
考题
单选题On a weather map,a large letter “h” means（）A
a high pressure area with cool, dry air and fair weatherB
a high pressure area with warm, moist air and inclement weatherC
horse latitudes, with rough seas and strong windsD
a heavy squall line near the “H”
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