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Ventilation pipes on flat roof of school building
Keywords:
fuel and power generation
factory
construction industry
steel
industry
tube
environment
pipeline
technology
pipe
no people
plant
distillation
oil
built structure
carbon dioxide
outdoors
chimney
water
social issues
pollution
transportation
heavy
metal
steam
equipment
chemical
business finance and industry
gas
refinery
engineering
gasoline
school system
carbon steel pipes
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