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hand holding test tube for analyses with water on the background of the reservoir, the concept of water purity, pollution of water bodies, checking the quality of drinking water in cities, environmental
Keywords:
liquid
education
hand
laboratory
human hand
close-up
water
holding
nature
discovery
scientific experiment
analyzing
equipment
science
chemical
research
scientist
chemistry
the chemistry of body
chemical analysis
nature test tube
radiation quality
environmental education
experiments with water
water flask
water test
test tube water
chemistry body
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