英文關鍵字
adjustment
background
business
chemical
close
construction
control
detail
engineering
equipment
factory
faucet
flap
flapper
fuel
gas
gasoline
gate
heat
industrial
industry
iron
lab
laboratory
line
machine
manufacturing
metal
oil
open
pipe
pipeline
piping
piston
plant
pressure
pump
red
stainless
steel
stop
tap
tube
valve
valves
vent
water