機器
assembly
background
blue
boiler
business
chemical
computer
construction
control
electricity
electronic
energy
engineer
engineering
engineers
equipment
factory
gas
helmet
industrial
industry
line
machinery
male
man
manufacturing
mechanical
metal
people
petrochemical
pipe
pipeline
pipes
plant
power
professional
radio
room
safety
steel
technician
technology
tube
work
worker
workers
working