機器
assembly
background
bar
bulldozer
cartridge
closeup
connection
construction
control
detail
energy
engine
equipment
excavator
fitting
fluid
fuel
gas
heavy
hose
hydraulic
industrial
iron
lift
line
machinery
macro
mechanical
metal
oil
part
pipe
piston
power
pressure
psi
pump
repair
science
shiny
steel
system
technology
tool
tractor
tube
valve
vehicle
work