機器
air
apparatus
ballast
complex
conduit
control
drain
engine
engineering
equipment
factory
faucet
flow
fuel
fuel pump
gas
gasoline
handhold
handle
hydrant
industrial
industry
iron
machinery
metal
military
oil
oil industry
old
outlet
panel
pipe
pipeline
power
pressure
red
rotation
steel
stopcock
switch
tap
technology
tool
turn
two
valve
water pump
wheel
white