Do PCBs cause cancer in humans?
多氯联苯导致人类癌症做呢？
多氯联苯是天然物质？
This can remove up to 50% of the PCBs.
这可以消除多达50%的多氯联苯。
How common are PCBs in the environment?
常见的是如何在环境多氯联苯？
When and why did production of PCBs stop?
什么时候，为什么停止生产多氯联苯？
How do mercury and PCBs end up in fish and the food supply?
汞和多氯联苯最终如何存在于鱼类和粮食中的呢？
Several properties of PCBs made them valuable for many purposes.
多氯联苯的几个性质使他们许多宝贵的用途。
The variety of physical properties of PCBs during mechanical treatment has been studied.
研究了废弃印刷线路板的主要成分在机械处理过程中的物理性质的变化。
The variety of physical properties of PCBs during mechanical treatment has been studied.
研究了废弃印刷线路板的主要成分在机械处理过程中的物理性质的变化。
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