A.clearing weather
B.that a warm front has passed
C.probable thunderstorm activity
D.an approaching hurricane or typhoon
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A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air
A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black
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
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Conventional anchors are least likely to hold in a bottom consisting of（）.
Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
Cumulonimbus clouds are formed by（）.
Corrosive liquids and acids should have which kind of label?（）
Day-shapes must be displayed（）.
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
Charts showing the coast of Mexico are produced by the United States（）.
Consideration should be given in planning for the mooring orientation in a new location so that in adverse weather a crane is available to off-load the supply vessel on what side of the unit?（）
Chart legends which indicate a conspicuous landmark are printed in（）.
Commercial ships or other persons or agencies requiring the assistance of Canadian Coast Guard icebreakers should first contact（）.