blueprint
business
chemical
construction
control
documents
energy
engineer
engineering
environment
factory
fuel
gas
gasoline
helmet
industrial
industry
inspection
inspector
job
machinery
maintain
maintenance
male
manufactory
men
metal
oil
oilworker
petrochemical
pipe
pipeline
pipelines
pipes
plant
power
professional
refinery
safety
site
station
steel
technician
technology
thermal
vest
worker
定額
Engineers discussing maintenance of a petrochemical plant. Technical inspection. Oil and gas industry.の素材 [FY31078237424]
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