機器
boiler
checking
compressor
construction
engineer
engineering
equipment
examining
faucet
fix
gas
generator
heating
house
industry
inspector
maintenance
male
man
manufacturing
measuring
mechanic
people
person
pipe
pipeline
plumber
portrait
pressure
professional
pump
repair
repairman
room
safety
service
setting
system
technician
technology
tool
valve
water
worker
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