precious metal

• Method of measurement of density for precious metals and their alloys
  贵金属及其合金密度的测试方法
• Specification for pastes of precious metals
  贵金属浆料规范
• Dental casting precious metal alloys
  齿科铸造贵金属合金
• Precious metal contracts trading broking
  贵金属合约买卖
• Contacts , electric , of precious metal
  贵重金属电器插头
• Application of finite element method in precious metals materials science
  有限元方法在贵金属材料学中的应用
• Method of measurement of resistivity of precious metals and their alloys
  贵金属及其合金材料电阻系数测试方法
• Precious metal distilled equipment
  贵金属提取设备
• And then in the seventh century we had money in the form of precious metal
  另外在七世纪时出现了贵重金属货币。
• Provision of permissible errors for measurement of precious metals adornment mass
  贵金属饰品质量测量允差的规定