单项选择题
Oil fires are best extinguished by （）.
A. cutting off the supply of oxygen B. removing the fuel C. spraying with water D. adding oxygen
单项选择题 You will extinguish a fire when you remove （）.
单项选择题 I’m on fire and have dangerous cargo on board. The most urgent assistance (最紧急的援助)in this case would be（） .
单项选择题 （）(停顿) for a while when the boat leaves the surface.
