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Insect Repellents: How to Choose
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日期:2025-05-17
Background: Developed by U.S. Army in 1946. Used by millions since 1957. World’s most widely used repellent. Chemical name: N,N-diethyl-m-toluamide or N,N-diethly-3-methyl-benzamide. Types: Concentrations range from 10% (for about 2 hours of protection) t...看更多