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Automatic snow melting systems can use:
1) Hot water and ethylene glycol mixed
2) All of the above
3) Hot water and antifreeze mixed
4) Infrared lamps mounted above sidewalks and ramps
5) Electric resistance heating
All of the above
The maximum temperature of water in a gravity hot water system is:
1) 65°C
2) 67°C
3) 70°C
4) 87°C
5) 77°C
77°C
In many buildings, the hot water heating system is divided into several circuits and the flow of water is controlled by:
1) An expansion tank in each heating zone
2) A circulating pump in each heating zone
3) A thermometer
4) A thermostat
5) A thermocouple
A circulating pump in each heating zone
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