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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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?（）
Changing rescuers while carrying out artificial respiration should be done（）.
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（）.
Corrosive liquids and acids should have which kind of label?（）
Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
Cyclones that have warm sectors usually move（）.
Clouds with the prefix “nimbo” in their name（）.
Chronometer error may be found by（）.
Control of fire should be addressed（）.