機器
ac
air
air conditioner
air conditioning
automotive
background
business
concept
condition
conditioner
conditioning
construction
control
cool
cooling
detection
electric
electrical
energy
engineer
equipment
fix
heat
heating
industrial
industry
installation
installing
maintenance
mechanic
pressure
pump
refrigerant
refrigeration
refrigerator
repair
repairman
service
system
technical
technician
technology
tool
vacuum