单项选择题
As the temperature for a given mass of air increases, the（）.
A.dew point increases B.dew point decreases C.relative humidity increases D.relative humidity decreases
单项选择题 Under threat, ship master activate SSAS system and send a message to（）.
单项选择题 Could you tell me（）the seaport（）?
单项选择题 I am a seaman, I come（）the People’s Republic of China.
