Lead or annealed copper washers are most often used in fluorine and other reactive fluoride service.
铅或退火铜垫圈最经常用于氟和其它活泼氟化物设施。
Conceal disturbing elements like iron, copper, lead with hydrogen fluoride amine-EDTA, add the potassium iodide to separate iodine, and take starch as indicator, titrate with sodium hyposulfite.
试样以王水分解、泡塑富集分离金，硫脲解脱，以硝酸-硫酸破坏硫脲，用氟化氢胺- EDTA掩蔽铁、铜、铅等干扰元素，加碘化钾使之析出碘，以淀粉为指示剂，用硫代硫酸钠进行滴定。
The fluoride in phosphate fertilizer production can not only impair workers' upper respiratory tract, bone and teeth, but also lead to fluorosis of bone.
结论磷肥生产中氟化物对作业工人上呼吸道，骨骼和牙齿有损害作用，可导致氟骨症。
Even tap water invariably contains a variety of poisons such as chlorine, chloramine, asbestos, pesticides, fluoride, copper, mercury, and lead.
就是自来水也必定含有各种有害物质，如氯、氯胺、石棉、杀虫剂、氟化物、铜、铅等。
Conclusions: the local application of fluoride gel with special complete tray assisting with oral care could lead to the desirable therapeutic effect for preventing radiation caries.
结论：用个别托盘技术，口腔局部使用含氟凝胶，并配合口腔护理，可达到理想的近远期预防放射龋效果。
Conclusions: the local application of fluoride gel with special complete tray assisting with oral care could lead to the desirable therapeutic effect for preventing radiation caries.
结论：用个别托盘技术，口腔局部使用含氟凝胶，并配合口腔护理，可达到理想的近远期预防放射龋效果。
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