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
LFG tank and pipeline maintenance should include（）.
Where should the tops of vents from gasoline tanks terminate?（）.
Name one major advantage of transporting gas under refrigeration.（）
Gasoline tanks should be filled（）.
To determine the pressure and temperature limitations under which LFG is required to be transported on a barge，you should look at the（）.
The shut off valve at the gasoline tank which can be operated from outside the tank space （）.
Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
Storage batteries should be charged in a well ventilated area because（）.
The weight of liquefied petroleum gas vapors as compared to air is（）.
The tops of vents from gasoline tanks should terminate（）.