A.abyssal plain B.continental shelf C.borderland D.offshore terrace
A.high density will be on the left in the Northern Hemisphere B.high density will be on the right in the Southern Hemisphere C.low density will be on the left in the Northern Hemisphere D.low density will be on the left in the Southern Hemisphere
A.air being warmed above the dew point B.saturation of cold air by rain C.a rapid cooling of the air near the surface of the Earth at night D.warm moist air being blown over a colder surface
A.navigable semicircle B.dangerous semicircle C.low pressure area D.eye of the storm
A.create large waves in the direction of the current B.change direction 360°during a 24 hour period C.remain fairly constant in direction and velocity throughout the year D.are characterized by a light green color
A.at right angles to the flow of the current B.against the flow of the current C.in the same direction as the flow of the current D.over slack water
A.V-shaped ripple with the point of the V pointing upstream B.V-shaped ripple with the point of the V pointing downstream C.small patch of smooth water on a windy day D.smoothing out of the vessel's wake
A.dew B.frost C.glaze D.snow
A.starboard bow and make as much headway as possible B.starboard quarter，and make as much headway as possible C.port quarter，and make as much headway as possible D.port bow，and make as much headway as possible
A.chute B.stabilized channel C.slough D.navigable pass
