It is widely used in petroleum, chemical boiler, shipbuilding, metal structure and mechanical manufacturing industry.

它广泛用于石油、化工锅炉、造船、金属结构及机械制造行业。

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This paper discussed the chemical structure, physiology, extraction, nutrition and process stability, analysis method and the future in medicine and food industry of folic acid.

论述了叶酸的化学结构、生理作用、提取方法、营养与加工稳定性、检测方法以及在医药和食品工业中的应用前景。

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This paper discussed thoughts of structure design, hydraulic design and seal design of HD type petrol - chemical process pump, in order to communicate with experts in petrol - chemical industry.

本文论述了HD型石油化工流程泵在开发研制过程中结构、水力设计以及密封问题上的思考，与化工行业的同行进行交流。

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