单项选择题
关闭所有防火门并使用干粉灭火器。()
A. Close all fire doors and use the dry powder extinguisher. B. Close all fire doors and use the foam extinguisher. C. Close all fire doors and use the CO2 extinguisher. D. Close all fire rooms and use the dry powder extinguisher.
单项选择题 立即发警报。()
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。()