單項選擇題The vapor pressure of a substance().

A.decreases as temperature increases
B.increases with the temperature
C.is not affected by temperature
D.may increase or decrease as the temperature rises


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1.單項選擇題The vapor pressure of a gas is the pressure necessary to keep it in a(n)().

A.soluble state
B.solid state
C.liquefied state
D.inert state

2.單項選擇題The tops of vents from gasoline tanks should terminate().

A.in open air
B.inside cabins
C.in machinery space
D.underwater

4.單項選擇題The shut off valve at the gasoline tank which can be operated from outside the tank space ().

A.controls the amount of gasoline to the engine
B.shuts off the gasoline supply at the tank
C.is used if the gasoline tank leaks
D.All of the above

5.單項選擇題The primary hazard of liquefied petroleum gas and liquefied natural gas is().

A.pressure
B.toxicity
C.temperature
D.flammability