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- A.Wind shift of 180°
- B.Large increase in wind velocity
- C.Decrease in the intensity of the system
- D.Increase in the intensity of the system
- A.Coriolis force
- B.The mid-latitude，semi-permanent high
- C.Differing atmospheric pressures
- D.The prevailing westerlies
- A.Ship's speed must be less than the true wind velocity
- B.True wind must be from dead astern
- C.True wind velocity must be faster than the ship's speed
- D.True wind must be from dead ahead
- A.weak pressure gradients and light，variable winds
- B.the formation of typhoons or hurricanes in certain seasons
- C.steady winds in one direction for six months followed by wind reversal for the next six months
- D.steady winds generally from the southeast in the Southern Hemisphere
- A.counter-clockwise circulation
- B.clockwise circulation
- C.trend from east to west
- D.trend from north to south
- A.counter-clockwise
- B.clockwise
- C.from east to west
- D.from north to south
- A.Brisk prevailing winds
- B.Light airs and calms
- C.Abundant blue sea grass vegetation
- D.None of the above
- A.Prevailing westerlies
- B.Geostrophic winds
- C.Doldrums
- D.Horse latitudes
- A.Mirage effects
- B.Sea smoke
- C.Extensive snowfall
- D.False horizons
- A.by the wind
- B.by the wind or by density differences in adjacent areas
- C.Coriolis force
- D.by ships sailing in the oceans
