機器
background
blue
building
business
compressor
construction
control
detail
diesel
electric
energy
engine
equipment
factory
fuel
gas
heat
industrial
installation
iron
line
machinery
maintenance
manufacturing
mechanical
metal
motor
oil
old
pipe
pipeline
plant
plumbing
power
pressure
production
pump
repair
stainless
steel
supply
system
technology
transportation
tube
valve
water
work
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