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Polyethylene plastic bags for food packaging can be sealed by heating

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A. polyethylene plastic bags for food packaging belong to thermoplastics, which can be sealed by heating, which is correct
B. hard water can be transformed into soft water by boiling, which is correct
C. during indoor barbecue, pay attention not to close the doors and windows, so as to prevent the lack of oxygen from generating carbon monoxide and making mistakes
D. the dirt in the toilet can be cleaned with dilute hydrochloric acid, which is correct
so C

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