aerated
air pollution
alertness
attention
building
building activity
checking
concept
concepts
concrete
concrete casting
construction barrier
construction industry
construction site
crawl space
danger
dangerous
digging
excavation
floor
flooring
focus
foundation
gas
home
ideas
lung cancer
magnifier
magnifying glass
natural gas
natural ventilation
paving
poisonous
pollution
protection
radiation
radioactive contamination
radioactivity
radon
radon test
research
risk
safe
safety
searching
security
soil
surveillance
ventilated
ventilation
定額
Preparatory stage for the construction of a ventilated crawl space in an old brick building - Searching gas radon concept image seen through a magnifying glass.の素材 [FY310151420434]
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