英文關鍵字
abstract
bar
billet
billets
blank
bright
bullion
business
commerce
construction
equipment
factory
heavy
industrial
industry
ingot
interior
iron
manufacturing
material
metal
metallic
motion
plant
plate
product
production
profile
raw
rod
rough
section
smelt
smelting
stack
stacked
steel
stock
technology
tube
tubing
warehouse
warehousing