单项选择题
Why is it necessary to warn engine room personnel before activating the fixed CO2 system?（）
A.To make them aware there is a fire B.To let them know they should leave the engine room C.To prevent possible injury from frostbite D.To make them aware that ventilation will automatically stop
单项选择题 The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.
单项选择题 An example of class "A" fire is a/an （）.
单项选择题 The most common type of containment device for spilled oil on the water is the use of （）.
