In complex formation, the metal ion is usually titrated with the standardized EDTA Solution in order to determine the metal content of sample. Therefore, it is widespreadly applied in practice.
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But it has limitation in complex formation drilling for its natural thermal instability and high sensitivity to salt contamination, whereas tannin could he modified to widen its using fields.
因其在使用中具有不耐温、不耐盐等较多缺陷,无法适用于特殊复杂的地层,但是通过对其改性,可以拓宽其应用范围。
And, as for his hopes to develop bedsheets that can actually prevent chronic wounds, the hurdles are great too-especially given the many complex factors involved in the wounds' formation.
至于他研制能够真正预防慢性创伤的希望,困难还很大——特别是涉及创伤形成中的诸多复杂因素。
In this paper, through the analysis of complex formation and leakage features of adjustment well in Zhongyuan Oilfield, the result shows that antileakage is key to drill successfully adjustment well.
中原油田地层情况复杂,漏失量大,通过对中原油田调整井地层复杂情况及漏失特点的分析,认为防漏是复杂区块调整井成功的关键,主要体现在防漏技术、配方、密度、流变性能、固控、起下钻措施等方面。
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