A.exposure limits
B.concentration limits
C.threshold limit values
D.substance limit values
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A.they generate heat
B.they emit hydrogen
C.of the toxic fumes they emit
D.they recharge faster in a well ventilated space
A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing
A.It increases its volume
B.It reduces its volume
C.It has less product per volume
D.None of the above
A.exclusion of all sand and solid matter
B.cleaning with clean fresh or sea water
C.examination for fractures and pitting
D.All of the above
A.that
B.which
C.who
D.these
最新試題
What normally helps in detecting escaping gas? （）
Name one major advantage of transporting gas under refrigeration.（）
The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
The amount of LFG that may be loaded into a given tank is determined by（）.
Combustible gas indicators operate by drawing an air sample into the instrument（）.
Gasoline vapor tends to collect（）.
When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
The vapor pressure of a substance（）.
Butadiene，inhibited，is labeled as a（）.
Which is NOT a safety precaution to be observed during the loading of LFG?（）