英文關鍵字
aqueduct
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circle
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detail
device
drip
duct
equipment
factory
faucet
gas
gaspipeline
gate
gatevalve
hydraulic
industrial
industry
irrigation
methane
multiutility
naturalgas
off
oil
oilpipeline
petcock
pipe
pipeline
piping
plant
plumber
plumbing
russian
service
shut
shutoff
shutoffvalve
sluice
sluicevalve
supply
system
tap
tube
ukraine
valve
water
watersupply
waterwork