Objective To explore the biological exposure indices ( BEI ) of dimethylformamide ( DMF ) in China.目的探讨我国二甲基甲酰胺 ( DMF ) 的生物接触限值 ( BEI ).Methods Reforming the Hodge method in synthetizing DMF.参照hodge法并作,改良合成1-脱氧-1-吗啉果糖(DM...
...preparatory talks for this week's summit in the Maldive Islands.为本周在马尔代夫群岛召开的峰会举行的预备会谈A girdle of islands enclosed the lagoon.一环小岛围绕着礁湖....a chain of islands known as the Windward Islands...名为“向风群岛”的岛群A freckle -...