单项选择题
Close all fire doors and use the （）（干粉灭火器）.
A. dry powder extinguisher B. foam extinguisher C. CO2 extinguisher D. portable extinguisher
单项选择题 The signals that will be used for emergency should be clearly （）（列出）.
单项选择题 It may be （）（补充）by individual cards issued to each member of the crew.
单项选择题 The （）(应变部署表)is posted in public places in different parts of the ship.
