rock mass quality classification

• 岩体质量分级

rock mass quality classification的用法和样例：

例句

1. To perform the Quality rating to classify the Supplier level.
   实施质量分级，按供应商水平分类。
2. The model with higher application value can be applied both in the quantitative analysis of storage reliability and in the quality classification of equipment.
   该模型既可用于装备不工作状态可靠性的定量分析，又可用于装备的质量分级，具有较高的应用价值。