...一级标准(Primary standards)是为了保护公众健康,包括保护哮喘患者、儿童和老人等敏感人群的健康;二级标准(Secondary standards)是为了保护社会物质财富,包括对能见度以及动物、作物、植被和建筑物等保护[14].
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二级标准物质 Secondary Reference Material ; working reference materials ; secondary standard substance
二级标准太阳电池 secondary standard solar ecll
二级标准硬度块 grade II standard hardness block
二级标准粘度液 secondary standard viscosity liquid
二级标准磁盘面 secondary standard reference surface
标准二级门架 maststd
二级光谱标准 secondary spectroscopic standard
二级操作标准 secondary operating standard
Besides, 1 sample point of Cd and 2 sample points of Hg were exceeded secondary standard value of "soil environmental quality standard".
其中,1个采样点的Cd和2个采样点的Hg超过《土壤环境质量标准》的二级标准值。
参考来源 - 通辽市污灌区土壤重金属的空间分布特征及迁移转化规律的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
通过对均匀性和稳定性的监测，符合二级标准物质的规范要求。
Through its uniformity and stability monitoring, the results showed that the substances meet the secondary standard specifications.
各污染指标可满足环境空气质量(GB3095—1996)中二级标准。
Each pollution index can reach the air environment quality level-2 standard (GB3095 -1996).
实验结果表明，该标准物质含水量低，均匀稳定，定值可信，可作为二级标准物质使用。
The test result has showed that the water content of this CRM is low, it is homogeneous and stable, its certified value is creditable and it can be used as second-rank certified reference material.
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