金属産業
abstract
abstract backgrounds
air conditioner
air duct
backgrounds
brass
business
business finance and industry
construction industry
construction material
copper
copper pipe
cylinder
electric fan
equipment
factory
heap
heat temperature
heavy
indoors
industry
manufactured object
manufacturing
manufacturing equipment
material
metal
metallic
metallurgy
new
part of
pipe tube
pipeline
production line
quality control
stack
stainless steel
storage compartment
storage room
technology
tube
warehouse
work tool
workshop