单项选择题
（）is best for electrical fire.
A. Dry extinguisher B. Power extinguisher C.A+B D. CO2 extinguisher
单项选择题 Which of the following is not the emergency equipment?（）
单项选择题 Which of the following is not the life-saving equipment? （）
单项选择题 What would you do if hearing an abandon ship alarm? （）
