单项选择题
A. Sound the bell immediately. B. Sound the alarm immediately. C. Ring the alarm immediately. D. Ring the bell immediately.
A. Prepare to abandon ship. B. Prepare for abandon ship. C. Prepare abandon ship. D. Prepare for ship.
A. They should be clear about all fire-fighting equipment.. B. They should be understood about the meaning of the different alarm signals. C. They should be clear about all life-saving equipment. D. They should be clear about the meaning of the different alarm signals.