The most dangerous fuel gas, due to its ability to ignite in low concentrations with air, is _____
a. argon
b. helium
c. propane
d. acetylene
d
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Consumable inserts may be used in conjunction with ____________________ groove welds.
Fill in the blank(s) with the appropriate word(s).
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Oil traps are reservoirs of petroleum found within porous sedimentary rocks
Indicate whether the statement is true or false.
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In which type of piping system is the first heating unit supplied with hot water also the last heater to return its water to the boiler?
A. series loop B. one-pipe system C. two-pipe system D. two-pipe reverse return system
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What is the chief economic disadvantage of recycling plastics?
What will be an ideal response?
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