1. chemicals that are used as raw materials in production, such as paint, powder, oil, resin, etc. 68 Oil.2. chemical substances used in maintenance, such as oil, grease, etc.3. chemicals used to eliminate the pest, such as glue traps, rat. Lizard home Termite removal, etc.4. chemicals used in cleaning, cleaners, scrubbing the floor include: Bathroom cleaners, etc.5. chemicals used in the laboratory include the buffer pH 4 and 7, etc.
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