选择性的例句（选择性在句子中的用法）

• NMA was hydrogenated to 3 - amino - 4 - methoxyacetanilide ( AMA ) with S - Ni as catalystin liquid phase. 以改性的骨架镍为催化剂催化3-硝基-4-甲氧基乙酰苯胺(NMA)液相选择性加氢制备了 3- 氨基 -4- 甲氧基乙酰苯胺 ( AMA ).
• The alternative forgone is called the opportunity cost. 这种选择性的放弃就叫做机会成本.
• Selectivity of human migration long been the focus of demographers and economists. 人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点.
• These reactions catalyzing oxidation of alcohol - OH groups have high yield and selectivity. 使用的催化剂对醇 羟基 的氧化具有高度的选择性并有很高的转化率.
• In the reserves of Zimbabwe and South Africa, annual culls are already routine. 在津巴布韦和南非的自然保护区，每年的选择性捕杀已成惯例。
• The results demonstrate that this catalyse has an excellent activity and selectivity this reaction. 结果表明该催化剂对此合成反应具有很高的催化活性和产物选择性.
• A PVC membrane sodium ion - selective microelectrode based on a neutral carrier ( ETH 1097 ) has been constructed. 研制了以中性载体 ( ETH1097 ) 为电活性物质的PVC钠离子选择性微电极.
• The mesh size selectivity can be expressed by logistic or Richards equation. 网目选择性常以Logistic或Richards方程来描述.
• Objective : To investigate the feasibility of cricothyroid laryngotomy instead of incision of trachea. 目的: 环甲膜切开选择性代替气管切开的可行性.
• Jakes frequency selective fading channel model complete source code, has been tested. 杰克斯频率选择性衰落信道模型的完整的源代码, 已经过测试.
• To improve the IR absorption of hydrotalcite, we intercalate SO 42 - to partly replace CO 32 - of interlayer. 对水滑石红外吸收机理的研究表明,水滑石的层间阴离子起主要作用, 层板具有协同效应.为提高水滑石的红外吸收选择性,通过对不同阴离子的分析和筛选,确定在水滑石层间插入硫酸根.
• This thesis selects hydrotalcite as selective IR absorption material by its characters of layer and ion - exchangeable. 本论文利用水滑石层状结构特点和层间离子的可交换性,将其作为选择性红外吸收材料.
• A hydrocracking catalyst with high selectivity to middle distillates was developed. 开发了一种具有较高的中油选择性的加氢裂化催化剂.
• Selective dehydration of hexose, such as D - fructose, is one of main synthetic methods for 5 - hydroxymethylfurfural. 果糖等己糖选择性脱水是制备 5- 羟甲基糠醛的主要方法之一.
• However, it is difficult to produce multi branched i heptane and restrain its cracking. 正庚烷异构化的难点在于高选择性地生成多侧链异庚烷和抑制异庚烷的裂化反应.
• Diethyldithiocarbamate was more better selective collector than Xanthate on galena. 与黄药相比,乙硫氮是方铅矿更好的选择性捕收剂.
• All patients underwent an elective osseous surgical procedure on the forefoot. 所有病人都作了前足的选择性骨手术.
• It'shows a thousandfold selectivity for fluoride over other common anions. 它对氟离子的选择性比其它普通阴离子高几千倍.
• Memory is selective and fallible. 记忆有选择性而且会出错。
• The selectivity of extractant is high and only Au, Pd , Hg ete. are extracted. 该萃取剂选择性高,它仅萃取Au 、 Pd和Hg等几种元素.