选择性

The experimental results showed that Zn-P/HZSM-5 catalysts had high activity, stability and selectivity to aromatics.

结果表明，Zn-P/HZSM-5催化剂具有很高的活性、稳定性和芳烃选择性。

The catalytic performances of prepared zeolite as catalysts for propane aromatization were investigated on a fixed-bed micro-reactor.

具有与苯分子动态直径相近的ZSM-5分子筛具有较高的烷烃转化率和芳烃选择性。

The investigation results indicate that:(1) During the process of waste acid, based on the proposed result of air oxidation flocculent precipitation, arsenic in waste acid can be transformed to high-class white arsenic or arsenic acid copper product.

在前人研究结果的基础上，根据含砷污酸与含砷废渣中主要元素存在形态和性质提出了用空气氧化絮凝沉淀法从污酸制备砷酸铜和白砷新处理工艺；提出了铟生产过程中选择性硫化沉淀除砷，提出了含砷废渣对土壤影响的治理方案。

It was found that this polymeric arsine palladium(0) complex is a highly active and stereoselective catalyst for arylation of styrene or acrylic acid.

通过用水合肼对上述聚硅氧烷负载的单齿胂钯配合物进行还原制备了聚硅氧烷负载的单齿胂钯(0)配合物，研究表明它是苯乙烯、丙烯酸芳基化反应的高活性和高立体选择性的催化剂。

Methods 35 cases were performed with left ventriculogram, ascending aortogram and selective coronary arteriogram including hepatoclavicle, long axial oblique, right anterior oblique, posteroanteroposterior and latercal projections.

35例均采用肝锁位、长轴斜位、右前斜位、后前位及侧位分别进行左心室、升主动脉和选择性冠状动脉造影。

Objective To evaluate the value of diagnosis and treatment of selective renal arteriography and embolization for renal hemorrhage.

目的 评价选择性肾动脉造影诊断和栓塞治疗肾出血的临床价值。

To evaluate the feasibility,safety and clinical application of selective renal arteriography accomplished through radial artery pathway.

评价经桡动脉途径行选择性肾动脉造影的可行性、安全性及其临床意义。

Selective arteriography and embolization possesses higher practical value in the treatment of lumbosacral neoplasms.

选择性动脉造影及栓塞术在腰骶椎肿瘤治疗中具有较高的应用价值。

However, led to a mixture of 4 and 5 the reaction with aryl ketone oximes. Regioselectivity of the reaction and configuration of the products are discussed.

文中讨论了反应物的空间效应、亲核试剂对该反应区域选择性的影响，并论证了产物的构型。

Based on the above analysis, a series of 5-alkyl-6-naphthylmethyl-1-(aryl or alkyoxyl-carbonyl-methyl) uracils were designed.

本文成功探索了在 C5-位引入溴的高区域选择性方法，为今后 C5-的结构改造提供了一条有效可行的途径。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。