英文關鍵字
canal
control
culvert
distribution
ditch
drain
drainage
dripping
duct
gate
ground
handle
housing
improve
industrial
knob
lock
maintenance
metal
outdoor
pipe
pipeline
piping
pressure
thread
tool
tube
tubing
valve
valves
water
wet
wheel
英文關鍵字
canal
control
culvert
distribution
ditch
drain
drainage
dripping
duct
gate
ground
handle
housing
improve
industrial
knob
lock
maintenance
metal
outdoor
pipe
pipeline
piping
pressure
thread
tool
tube
tubing
valve
valves
water
wet
wheel