A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black
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A.soft clay
B.hard mud
C.very soft mud
D.sand
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
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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（）.
Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
Day-shapes must be displayed（）.
Conventional anchors are least likely to hold in a bottom consisting of（）.
Daylight savings time is a form of zone time that adopts the time（）.
Cumulonimbus clouds are formed by（）.
Denebola is found in what constellation?（）
Cyclones that have warm sectors usually move（）.