Adopting four kinds of matrix composition and getting twelve samples, measuring its hardness and wear strength.
采用四种胎体配方得到12个试样，并对其进行了硬度，磨损检测。
Most management structures of companies are matrix composition, and the project manager on model management is full-time.
相当多企业的组织结构基本上是矩阵结构，负责型号管理的项目经理也都是全职的。
The dry vibration material with the matrix composition of 9% super-grade bauxite and 2% spinel has the best penetration resistance.
在基质中引入9%特级矾土的基础上再引入2%的尖晶石后，干式料的抗渣渗透性能最佳。
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