gloved hand into the water collecting tube analysis purity environment ecology concept testing |
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| navigate by keyword : analysis bacillus bacteria bad biological blue chemical cholera close collecting concept danger discharge distribution ecology emissions environment epidemics gloved gloves hand harmful health impurities infection infections liquid material measurement mens nature plague pollution purity quality radiation sample sea state study substance test testing tests tube waste water |
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| Water sample. Gloved hand into the water collecting tube. Analysis of water purity, environment, ecology - concept. Water testing for infections, harmful emissions |
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