help me pls
1 precautionary measures dealing with light
2 precautionary measures when dealing with heat
1 precautionary measure when dealing sound
THANKS
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help me pls
1 precautionary measures dealing with light
2 precautionary measures when dealing with heat
1 precautionary measure when dealing sound
THANKS
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1 precautionary measures dealing with light
2 precautionary measures when dealing with heat
1 precautionary measure when dealing sound