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。
Jewelry can be made of anything from gold and silver with pearls and diamonds to copper washers with natural stone beads.
珠宝饰品的材料从金、银、珍珠、钻石到砂磨的天然石头珠子，五花八门，珠宝中的宝石及各种材料应该融合的而不是互不相关的。
Metal washers made of iron, steel, copper, etc. according to supplied drawings or samples.
金属垫圈，材料：铜、铁、钢等，依来图来样生产。
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