单项选择题
A.Fair weather B.Precipitation and cloudiness C.Scattered clouds at high elevations D.Gradual clearing and cooler temperatures
A.Non-follow-up B.Rudder adjustment C.Weather adjustment D.All the above may be activated
A.Clear weather with no wind，but the possibility of rain or snow within 24 hours B.Deteriorating weather with rain or snow C.Heavy rain or severe thundershowers D.Clearing weather，possibly accompanied by high winds