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单选题
If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position，what winds can you expect in the Northern Hemisphere?（）.
A
East to northeast
B
East to southeast
C
North to northwest
D
South to southeast
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单选题According to Buys Ballot’s law，when an observer in the Northern Hemisphere experiences a northwest wind，the center of low pressure is located to the（）.A
northeastB
west-southwestC
northwestD
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单选题Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.A
Expect to see cirrus clouds followed by altostratus and nimbostratus cloudsB
Alter course to remain in the navigable semicircleC
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单选题What benefit is a weather bulletin to a mariner（）.A
It provides a legal reason to cancel a projected voyageB
It allows the mariner to make long term weather forecastsC
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单选题Two well-developed high pressure areas may be separated by a（）.A
Hill of low pressureB
Trough of low pressureC
Valley of low pressureD
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rising warm airB
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Fair weatherB
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单选题What will a veering wind do（）.A
Change direction in a clockwise manner in the Northern HemisphereB
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单选题The greater the pressure difference between a high and a low pressure center，the（）.A
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单选题If an observer in the Northern Hemisphere faces the surface wind，the center of low pressure is to his（）.A
left，slightly behind himB
right，slightly behind himC
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right，slightly in front of him
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NNWB
WSWC
ESED
SSW
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单选题If the center of low pressure is due west of you in the Northern Hemisphere，which wind direction should you expect（）.A
South to westB
South to eastC
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North to east
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