A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air
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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
A.Weather side
B.Leeward side
C.Upwind side
D.Crosswind side
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Chart legends which indicate a conspicuous landmark are printed in（）.
Class I and II private aids to navigation in or along navigable waters of the United States are listed in the（）.
Charts showing the coast of Mexico are produced by the United States（）.
Compliance with the terms of the load line certificate on a ship is the responsibility of the（）.
Corrosive liquids and acids should have which kind of label?（）
Define the acronym MSI（）.
Clouds form（）.
Conventional anchors are least likely to hold in a bottom consisting of（）.
Cyclones that have warm sectors usually move（）.
Compared to a low pressure system，generally the air in a high is（）.