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In North America, AC power is produced at a frequency of ___ cycles per second (also known as ___ hertz) {Ans: 60}What would be the easiest to control or eliminate in a leak situation (before a fire occurs) {Ans: Shutting off the fuel}(T/F) The gas code does not permit the repair of a damaged heat exchanger in a dwelling {Ans: True}When installed underground, which type of copper tuning does not require a protective coating? {Ans: Type K}What is natural gas mainly comprised of? {Ans: methane}(T/F) Current will be the same throughout the series circuit? {Ans: True}