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 concern is a common one, but studies have found that most of the widely available supplements contain little or no mercury, dioxins or PCBs.
这是令人共同担忧的问题，但研究发现，大多数的广泛使用的补充剂含有很少或根本没有汞、二恶英和多氯联苯的物质。
Thompson's rigorous quality control procedures test all raw materials to ensure no chemical pollutants such as PCBs, mercury and lead.
汤普森的严格的质量控制程序测试所有原材料，以确保没有化学污染物，如多氯联苯，汞和铅。
Thompson's rigorous quality control procedures test all raw materials to ensure no chemical pollutants such as PCBs, mercury and lead.
汤普森的严格的质量控制程序测试所有原材料，以确保没有化学污染物，如多氯联苯，汞和铅。
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