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
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It should be noted（）the use of synthetic mooring ropes able to produce sparks by their manipulation is absolutely forbidden on board petroleum tankers and LPG or LNG carriers，or any vessels carrying inflammable substances.
Combustible gas indicators operate by drawing an air sample into the instrument（）.
The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
The amount of LFG that may be loaded into a given tank is determined by（）.
If you have a liquefied flammable gas barge in tow，which is NOT required of you with respect to the barge and its cargo? （）
Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.
LFG tank and pipeline maintenance should include（）.
Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
What is the proper first aid for LPG in the eye? （）
The shut off valve at the gasoline tank which can be operated from outside the tank space （）.