如四氯化碳分 子吸收光子后脱去一个氯原子： CC l 4 +hr _—— CCl 3 +Cl 49 多氯联苯（ 多氯联苯（ PCBs PCBs ） ） 结构与性质： 多氯联苯是一组由多个氯原子取代联苯 分子中氢原子而形成的氯代芳烃类化合 物。
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For these reasons, all fluorescent lighting ballasts which are not specifically labeled "no PCBs" must be suspected to contain PCBs.
基于这些原因，所有这些荧光灯镇流器没有明确标示“无多氯联苯”必须被怀疑含有多氯联苯。
The hole metallization of rigid-flex PCBs which including Drill, Desmear, electroless plating, Electrical plating, is a key process in the manufacturing of rigid-flex PCBs.
该孔金属化工艺是整个刚挠结合板生产制造工艺的核心，包括钻孔、去钻污、化学镀铜、电镀铜等工序。
With widely used, more and more PCBs entered environment and accumulated there. The prevention of PCBs is specially important due to its toxicity and the difficulty of degradation .
随着多氯联苯的广泛使用，越来越多的多氯联苯进入环境，并在环境中积蓄下来。由于多氯联苯的难降解性和毒性，所以防治多氯联苯的污染尤为重要。
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