英文關鍵字
argon
auto
boiler
boilerhause
caucasian
check
checking
circulation
condensing
controlling
data
engineer
equipment
examining
faucet
gas
girl
goggles
heating
indicator
industrial
industry
inspection
inspector
magazine
maintenance
manometer
measuring
one
pipe
pipeline
pipes
plumber
pressure
pump
repairman
steam
system
teaching
technician
technology
thermostat
valve
vessel
water
woman
worker
workwear