Primary Air Quality Standard主要空气质量标准

primary products quality农产品质量

national primary ambient quality standard国家一级环境空气技师标准

primary quality casting一级铸件

primary quality indexes主要品质因子

primary school teachers quality小学教师素质

primary school teachers' quality小学教师素质

quality primary mirror优质主镜

high-quality primary mirror优质主镜