英文關鍵字
boy
business
centrifugal
centrifuge
chemical
circulating
cleaner
cleaning
construction
degasser
dirt
dirty
drill
drilling
earth
energy
environment
equipment
factory
fuel
funnel
gas
ground
industry
innovation
line
metal
mud
oil
open
petroleum
pipe
pipeline
pollution
poor
power
production
pump
refinery
russia
technologies
technology
tube
vacuum
well
work