機器
building
check
chiller
compressor
condition
conditioning
contractor
engineer
engineering
equipment
examining
hardhat
helmet
hvac
industrial
industry
inspecting
inspection
inspector
job
maintenance
male
man
manual
measurement
men at work
occupation
outdoors
people
pipe
pipeline
plant
plumber
professional
protection
pump
quality
repairing
safety
service
site
system
tank
technician
tube
valve
water
work
worker