单项选择题
Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）
A.Carbon dioxide is corrosive when exposed to fire B.Carbon dioxide should be applied slowly to a large engine room fire C.Its total cooling effect is far greater than water D.Its smothering effect is excellent for class B fires
单项选择题 If fuel is burned from only the starboard tanks, the ship will （）.
单项选择题 In cleaning up an oil spill, the use of chemical agents would （）.
单项选择题 Why is it necessary to warn engine room personnel before activating the fixed CO2 system?（）
