?When plastics pieces are dissolved in a volatile solvent in casting, hardening occurs as a result of _____.
A. ?catalysts
B. ?added heat
C. ?solvent evaporation
D. ?high pressure
Answer: C
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____ is the most common type of fuel gas used for oxyfuel welding.?
A. ?MAPP B. ?Acetylene C. ?Propane D. ?Oxygen
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with the appropriate word(s).