It is called counter selection when there is a behavior of concealing information before signing a contract and called moral risk after signing a contract.

发生在契约签订前的隐瞒信息行为叫逆向选择，发生在契约签订后的隐瞒信息行为叫道德风险。

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The process of selection of corrosion inhibitor for the fractionator overhead of diesel hydrotreating unit was summarized. The corrosion of the unit was analyzed and counter measures were proposed.

文章对汽柴油加氢精制装置分馏塔塔顶所注缓蚀剂的筛选工作进行了总结，并对装置腐蚀进行了简要分析，提出了对策。

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To counter the reasonable selection of blast parameters in the process of coal production in a composite coal seam face, a series of on-the-spot tests were conducted.

针对复合煤层回采工作面煤炭生产过程中爆破参数的合理选取问题，进行了一系列现场试验。

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