Worker under checking the waste water treatment pond industry large to control water support industry
Palabras clave
water,
waste,
sewage,
engineer,
quality,
tank,
men at work,
cleaning,
pipe,
factory,
people,
horizontal,
ecology,
man,
working,
pollution,
microbiology,
helmet,
outdoors,
aeration,
quality control,
test tube,
one man only,
protective clothing,
working out,
controlling,
teamwork,
water treatment plant,
two people,
hard hat,
storage tank,
male
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