Isoamyl butyrate was synthesized by using ceric sulfate as the catalyst.以硫酸高铈为催化剂,正丁酸和异戊醇为原料合成了正丁酸异戊酯.In the presence of ethanonitrile and glycol, anisole reacts with ammonium ceric nitrate to form o - nitroanisole.在乙腈、聚...
他们的水在几周以前就毫无理由地被切断了。Their water was turned off weeks ago without explanation.志愿者记录下他们一周所吃的所有食物。The volunteers kept a record of everything they ate for a week.新的饮食类书籍差不多一周出一本。New diet books appear at a rate of nearly one ...
胚细胞和糊粉层中的代谢活性立即活跃起来.Metabolic activity quickly develops in the cells of the embryo and the aleurone layer.这些囊胚细胞, 称卵裂球, 每个细胞都有一套二倍体染色体组.The cells of the blastula , called blastomeres, also each receive a full diploid set...