機器
abstract
background
blue
business
chemical
close
construction
control
energy
engineering
environment
equipment
factory
fuel
gas
gasoline
handle
heat
industrial
industry
iron
line
manufacturing
metal
natural
oil
open
parts
pipe
pipeline
piping
plant
power
pressure
production
pump
red
refinery
rig
rusty
screw
stainless
steam
steel
tank
technology
tube
valve
water