单项选择题
The use of sinking and dispersing chemical agents for removal of surface oil is（）.
A.the most common method B.too expensive for common use C.generally safe to sea life D.authorized only with prior approval of the governmental On-Scene Coordinator
单项选择题 The Safety Radio Certificate for the cargo Ship is issued（）.
单项选择题 The Safety of Life at Sea Convention was developed by the（）.
单项选择题 The number of certificated able seamen and lifeboatmen required on a ship is stated in the （）.
