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 concept danger discharge distribution ecology emissions environment epidemics gloves hand health impurities infection liquid material measurement mens nature plague pollution quality radiation sample sea state study substance test tests the 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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