In daily life, we often see triangular "back" labels with numbers printed on packaging bags. This represents the type of resin used in packaging materials and is an important basis for recycling and classification. For example, "01" represents PET (common beverage bottles), and "04" represents LDPE (common plastic bags). Understanding these signs can help us classify garbage more accurately, improve the purity and value of recycled materials, and contribute to environmental protection. Remember, packaging bags with severe pollution (such as oil stains) need to be treated before they can be recycled.
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