blueprint
building
business
chemical
computer
construction
design
drawing
energy
engineer
engineering
environment
equipment
factory
fuel
gas
helmet
industrial
industry
laptop
maintenance
manufacturing
mechanical
oil
people
person
petrochemical
petroleum
pipeline
plant
pollution
power
production
professional
refinery
safety
site
technology
work
worker
定額
Engineer wearing white helmet holding paper drawing with oil refinery background.の素材 [FY31077827137]
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