Piezo-electric quartz
收藏官方服务：
资源简介：
Brazil and Madagascar are the principal sources of the world supply of quartz crystal. During the early years of the war it appeared that the greatly increased demand for...
社区交流群
科研交流群
商业服务
Brazil and Madagascar are the principal sources of the world supply of quartz crystal. During the early years of the war it appeared that the greatly increased demand for...