單項(xiàng)選擇題The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.

A.boiling point
B.flash point
C.viscosity point
D.toxic point


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1.單項(xiàng)選擇題An example of class "A" fire is a/an （）.

A.electrical fire in the engine room
B.oil fire in the engine room bilges
C.oil fire involving a grade "A" petroleum product
D.mattress fire in a stateroom

2.單項(xiàng)選擇題The most common type of containment device for spilled oil on the water is the use of （）.

A.straw
B.booms
C.skimmers
D.chemical dispersants

3.單項(xiàng)選擇題A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）

A.The tank is safe to enter
B.The tank is especially dangerous to enter
C.Carbon monoxide is present
D.Water vapor present when the tank was sealed has oxidized

4.單項(xiàng)選擇題Fires occurring in combustible metals, such as sodium or magnesium, are classified as a （）.

A.class A
B.class B
C.class C
D.class D

5.單項(xiàng)選擇題A tank which has been sealed for a long period of time can be dangerous because （）.

A.steel surfaces consume oxygen by rusting
B.sealed tanks usually form a vacuum
C.moisture condenses in the tank, displacing the oxygen
D.most tank coatings give off poisonous vapors in the presence of moisture