单项选择题
A. Full astern！ B. Double full astern！ C. Emergency full astern！ D. Emergency three astern！
A. There are nine people in the deck department. B. The department has nine people C. There are nine people in the deck de D. The deck has nine people.
A. I am a sailor. I work as an OS on board. B. I am an AB I work as a sailor. C. I am a sailor. I work as a quartermaster. D. I am an AB I work as an oiler.