The alumina ceramics is gel-mould cast with low toxic N methylolacrylamide system. This paper reports the investigation on the preparation of alumina suspension and its solidification process.

采用低毒的N 羟甲基丙烯酰胺体系凝胶注模成型氧化铝陶瓷，研究了该体系下浓悬浮体的制备及固化过程。

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Unlike common amino acids, the preparation of these N-protected precursors requires rather elaborate synthetic schemes typically starting from the parent heterocycles.

与普通的氨基酸不同，这些N 段保护前体的准备需要更加复杂的合成方案，典型的合成从母链开始。

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In purifying phase, the extracts were disposed by silica gel column chromatography and preparation lamella chromatography, then crystaled by N-Hexane.

纯化阶段，硅胶柱色谱及制备型薄层色谱处理提取物，正己烷沉淀结晶。

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He is also promising to ensure that procedures laid down for collecting the U.N.panel's data are followed more strictly in the preparation of future reports.

VOA: standard.2010.01.23