機器
ammunition
background
batteries
black
blue
brass
caliber
capacity
closeup
component
construction
copper
current
electricity
electronics
energy
equipment
factory
firearm
generation
industrial
insulation
lead
light
machinery
manufacture
material
metal
part
pipe
power
production
protection
recharge
red
rolling
round
row
set
shiny
steel
technology
tool
tube
voltage
white
wooden
work
yellow