Which Characteristics Are Necessary for a Blowtorch to Heat Casting

Which characteristics are necessary for a blowtorch to heat casting alloys?

A) May operate on a combination of natural gas and compressed air for low-temperature alloys
B) May operate on a combination of natural gas and oxygen for higher temperature alloys
C) Must heat the alloy sufficiently to ensure a low viscosity of the alloy for casting
D) A, B, and C
E) A and C

Correct Answer:

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