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a scientist uses a microscope to look for contaminants in a test sample, a researcher uses a microscope to look closely at foreign objects, microscopes are being used in the laboratory
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Using Sand or Sawdust to Absorbent for Oil, Acid, Chemical, Liquid Spills Cleanup. Steps for Dealing with Chemical Liquid Spillage, Part of Basic Practical Training for Chemical Spill Cleanup.
Global warming concept . Dry cracks in the land, serious water shortages. Drought concept.
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