air quality control region [环境] 空气质量控制区 ; 空气品质控制区 ; [环境] 大气质量控制区
The paper introduces quality control technologies for concreting work, curing of beams, stretching and pressure grouting in the course of bridge precasting in the frigid plateau region.
介绍了高原高寒地区预制桥梁施工过程中混凝土施工、梁体养护、张拉压浆等的质量控制技术。
Some research work of voltage reactive power optimization control of region network has been done in order to improve the voltage quality and decrease the power loss;
为了提高电压质量，降低电能损耗，本论文针对我国地区电网的状况和特点，对电网电压无功优化控制进行了深入的探索和研究；
In conventional soil environment quality evaluation, the regional soil background values or the contents in the soil control points of evaluated region were used as evaluation criteria.
以往土壤环境质量评价中，一般是以区域土壤背景值或评价区土壤对照点含量作为评价标准。
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