Asymmetric 1, 3 - dipolar cycloaddition can be strongly catalyzed by chiral oxazaborolidines.手性唑硼烷酮能够催化不对称1, 3偶极加成反应并取得很好的效果.The cycloaddition itself is the slow step.环化作用本身是慢的一步....
Bernstein's compositions spanned all aspects of music, from symphonies to musicals.伯恩斯坦创作的乐曲涉及了从交响乐到音乐剧等音乐的各个方面。In order to represent Archimedes helix with control polygon, we construct Bernstein - like basis.为了用控制多...
狭长形宝石被切成细条形的宝石.A gem cut in the form of a narrow rectangle.畦灌可以描绘成长条形的格田,沿其长边方向具有较缓的坡度.Border irrigation can be described as elongated basins with a gentle slope in the long direction....
Objective To study the clinical characteristics of children orbital dermoid cyst.目的探讨小儿眼眶皮样囊肿的临床特点.Objective To study the CT findings of dermoid cyst of the orbit.目的分析眼眶皮样囊肿的CT表现.Giant dermoid cyst of the petrous apex.大熊...