A.soft clay
B.hard mud
C.very soft mud
D.sand
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A.immediately after restoring vital services
B.immediately
C.following control of flooding
D.following establishment of fire boundaries
A.prevailing westerlies
B.horse latitudes
C.trade winds
D.subpolar low pressure belts
A.Weather side
B.Leeward side
C.Upwind side
D.Crosswind side
A.When at anchor，the pilot vessel is only required to sound anchor signals
B.The identification signal must be sounded any time the pilot vessel is underway
C.The pilot vessel may only sound the identity signal when making way
D.All of the above
A.Greenwich celestial meridian
B.hour circle of the body
C.local celestial meridian
D.vertical circle of the body
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Changing rescuers while carrying out artificial respiration should be done（）.
Commercial ships or other persons or agencies requiring the assistance of Canadian Coast Guard icebreakers should first contact（）.
Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.
Deneb is found in what constellation?（）
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
Charts showing the coast of Mexico are produced by the United States（）.
Deficient oxygen content inside a chain locker can be detected with（）.
Compared to a low pressure system，generally the air in a high is（）.
Day-shapes must be displayed（）.
Coiling new rope against the lay，bringing the lower end up through the center of the coil，then coiling with the lay，in order to remove the kinks，is known as（）.