機器
acid
anode
bath
bathtub
cathode
closeup
company
control
copper
electricity
electrolysis
electrolyte
electrorefine
engineering
equipment
extreme
factory
finished
get
industrial
industry
install
large
liquid
machinery
manufacture
manufacturing
material
metal
metallurgy
plant
process
production
pure
refine
refinement
science
smelter
sulfuric
sulphate
technology
work
workshop