单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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