英文關鍵字
access
building
chamber
closeup
condensate
construction
culverts
discharge
drain
drainage
engineering
equipment
exchanger
factory
flow
gate
heat
hole
industrial
industry
installation
irrigation
liquid
open
pipe
pipeline
pipes
piping
plumber
pressure
sewage
sewer
sewerage
site
steam
system
systems
the
tube
valve
water