Send soil samples to lab for compaction test so as to determine the most reasonable water content ratio to enable on-site control of dry density.
将土样送试验室做击实试验，确定其最优含水率和现场控制干密度。
The accuracy can be optimized by strengthening quality control of critical factors in the process of test of ammonia density in indoor air with indophenol blue photometric method.
通过对室内空气中氨的靛酚蓝分光光度法检测的整个相关过程的影响因素进行质量控制，从而提高室内空气中氨浓度检测的准确性。
Test results show that controlling the stability of the pattern of flow is the main measure to control the density flow in the sedimentary basin.
研究表明：控制水流流型的稳定性是对沉淀池中异重流进行控制的主要措施。
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