单项选择题
A.extremely cold air from shore passes over warmer water
B.warm dry air from shore passes over cooler water
C.cold ocean water evaporates into warm air
D.cool rain passes through a warm air mass
单项选择题 RYUKYU S TO SE 6 BEC 4－5.ISOL SHWRS.SEA 3 M BEC 2 M.SWELL SE 3－4M.This description is likely to be under the heading of（）.
单项选择题 Periodic publications notifying changes in，or additions to，previously published navigational data are（）.
单项选择题 On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.