機器
blue
bolt
business
cable
chemical
cladding
close
connection
construction
elbow
engineer
engineering
equipment
factory
flange
fuel
gas
huge
industri
industrial
industry
insulation
iron
line
metal
nuclear
nut
oil
pipe
pipeline
piping
plant
plumbing
power
powerful
preparation
sky
stainless
steel
support
technology
tool
tube
valve
waste
weld
wheel
work
zinc