单项选择题
立即发警报。()
A. Sound the bell immediately. B. Sound the alarm immediately. C. Ring the alarm immediately. D. Ring the bell immediately.
单项选择题 准备弃船。()
单项选择题 他们应该明白不同报警信号的意义。()
单项选择题 机舱人员应启动机舱里的消防泵。()