A.the Canadian Coast Guard
B.Ice Sarnia
C.the Ice Navigation Center
D.the icebreaker assigned to the area
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A.coiling
B.faking
C.flemishing
D.thoroughfooting
A.pilot charts
B.Notices to Mariners
C.Tide Tables
D.Current Tables
A.are sheet or layer clouds
B.have undergone great vertical development
C.are middle or high altitude clouds
D.are rain clouds
A.as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small droplets
B.as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming clouds
C.dry air compresses moisture from the atmosphere into clouds
D.when the relative humidity of the atmosphere is low
A.high pressure fluid accumulators
B.driving air-powered plunger pumps
C.filling open-circuit breathing systems
D.bladder-type accumulators
最新試題
Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Denebola is found in what constellation?（）
Compared to a low pressure system，generally the air in a high is（）.
Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.
Complete information on weather broadcasts throughout the world is contained in（）.
Chronometer error may be found by（）.
Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.
Cyclones that have warm sectors usually move（）.
Clouds with the prefix “nimbo” in their name（）.
Deneb is found in what constellation?（）