单项选择题
A.Is 50% water saturated B.Is 90% water saturated C.Temperature is greater than the dew point temperature D.Temperature is equal to，or below the dew point temperature
A.Distance a wave travels between formation and decay B.Stretch of water over which a wave-forming wind blows C.Time in seconds required for two crests to pass a given point D.Measurement of a wave's steepness
A.westerly B.parallel to the isobars in the warm sector C.toward the nearest high pressure area D.faster than the accompanying cold front