The reasons for the leakage of high-pressured ammonia pre-heater row tubes and seals were explained, and how to handle and prevent the occurrence of similar accidents was proposed.

分析尿素装置高压氨预热器多次发生列管及封头泄漏的原因，提出如何处理及防止类似事故的发生。

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The reasons for the leakage of high-pressured ammonia pre-heater row tubes and seals were explained, and how to handle and prevent the occurrence of similar accidents was proposed.

综述合成氨二段转化废热锅炉失效历程分析 ，废热锅炉列管穿孔、管板泄漏及水压试验泄漏的原因 ，提出解决对策。

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“This row is a north to south transect along the East Coast, ” he said one day recently, pointing to tubes containing samples collected at sites from Cape Cod to Key West.

“这一组沙是东海岸沿岸从北至南的样本。” 最近的某天他指着一些试管说。

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Below that is a row of four test tubes, marked with a circle, an X, a square and a plus sign.

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