機器
background
business
cast
cast iron
casting
circle
circular
connection
cylinder
design
development
dimensional
drip molding
energy
engineering
enhancement
equipment
factory
gray
group
heavy metal
horizontal
industrial
industry
iron
joint
machinery
many
mechanical
mechanism
metal
metal background
metallic
object
part
piece
power
precision
round
shaft
silver
steel
strength
technology
tool
transmission
various
wallpaper