Webb12 apr. 2015 · 这道题提到了一种作用原理:. 许多避孕环是铜制的。. 铜与子宫里的盐酸反应可以生成超氧酸(HO2). Cu+HCl+O2 -->CuCl + HO2. (俩产物高中化学都没出现过,别太在意细节) HO2/是一种不稳定的自由基。. 有很强的反应活性,可以杀死精子。. 至于这是不是 … Webb3 apr. 2024 · RA Nelson actively manages your construction budget and controls cost with real-time budgetary tools, monthly cost-to-complete analyses, and a comprehensive understanding of the design. 4.
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