initial control；primary control 在材料或结构构件的试生产阶段，根据规定质量要求，通过试配制或试运行确定合理的原材料组成和工艺参数，以及为生产控制提供材料和结构构件性能的统计参数所进行的试验性控制。
在点源污染得到初步控制的情况下，非点源污染已经成为水源地的重要污染源。
Under the circumstance that point source pollution is basically controlled, non point source pollution has already become an important pollutant source.
通过理论分析和控制原理可行性实验研究，证明该阀的控制原理完全可行，而且可使分流误差初步控制在1%以内。
Both the theoretical analysis and the experimental research show that not only the control principle is feasible but also the flow-division error can be controlled within 1%.
免费控制工具，以及在它们基础上自行开发的系统，只为检查文件的输入输出提供了初步的支持。
Free source control tools, and the homegrown systems based on them, provide only rudimentary support for checking files in and out.
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