筛选以2 -溴代丁酸为起始原料，经氨解，酯化，酯胺解，拆分，环合五步反应制得左乙拉西坦。
Screening for 2 - bromo-butyric acid as the starting material, after ammonolysis, esterification, ester amine solution, split, five-step cyclization reaction Levetiracetam.
以问卷的方式来？解影响母乳哺育之起始与持续时间的相关因素。
A questionnaire was designed to elucidate factors influencing the initiation and duration of breast-feeding.
在等温环境下，对垃圾单组分和混合组分的热解特性研究表明：垃圾热解几乎都是集中在某个时间段内完成，但是，热解起始时刻、终止时刻不尽相同。
Under isothermal condition, the results show that the pyrolysis of MSW nearly all is occurred on one time range, but it's initiative time and terminal time is not same.
应用推荐