機器
air
boiler
breathing
business
checking
chemical
danger
dangerous
design
dust
energy
engineer
engineering
environment
equipment
face
factory
filter
gas
goggles
health
hood
human
industrial
industry
inspector
job
machinery
maintenance
man
mask
mechanical
overalls
personal
pipe
pipes
plant
pollution
power
pressure
prevention
protection
protective
repairman
safe
safety
security
specs
steel
suit
system
technical
technician
technology
toxic
valve
vessel
water
white
work
worker
working
workwear