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
最新試題
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
Corrosive liquids and acids should have which kind of label?（）
Charts showing the coast of Mexico are produced by the United States（）.
Deficient oxygen content inside a chain locker can be detected with（）.
Chart legends printed in capital letters show that the associated landmark is（）.
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
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?（）
Day-shapes must be displayed（）.
Cumulonimbus clouds are formed by（）.
Changing rescuers while carrying out artificial respiration should be done（）.