选择性

The effects of the preparation and reaction conditions on the conversion and isomerization selectivity of n-heptane were studied carefully.

详细讨论了催化剂的制备条件和反应条件的改变对正庚烷的转化率和异构化选择性的影响。

The higher selectivity to isopentenes, however, was regarded as a consequence of both insufficient active sites for further hydrogenation of isopentenes to isopentane and lower electronic interaction between Pd and the alumina surface.

而较高的选择性则可归因於没有足够的钯活性中心可供异戊烯进一步氢化生成异戊烷以及钯金属和氧化铝间较低的电子效应所致。

The selected prepared catalyst for isomerization of light oilis used under the reaction conditions of 260°C, 2.0MPa, WHSV=1.0h-1 , H2/Hydrocarbon molarration 4.0, n-pentane conversion rate is 62.17%,isopentane yield is 57.01%(isomerization rate is58.00%), isopentane selectivity is 91.60%, liquid product yield is 94.84%.

在 T=260°C，P= 2.0MPa ，WHSV= 1.0h-1 ，H/C5= 4.0 时，正戊烷转化率为 62.17%，异戊烷收率为 57.01%(产率为58.00%)，选择性为 91.60%，液体产物收率为 94.84%。

The poison activity, stomach toxicity action and nonselective food refusal activity of extracts and fractions obtained by extracting the stem of Mirabilis jalapa L against the 4th instar larvae of Pieris rapae L, with 3 polarity solvents（petroleum ether, chloroform and ethanol）were determined by the methods of feeding, leaf-sandwich and leaf dish.

用饲喂法、叶片夹毒法、叶磲法测定了紫茉莉茎的3种极性溶剂提取物及萃取物对菜粉蝶幼虫的毒杀活性、胃毒作用、非选择性拒食活性。

Owing to the Janus-faced properties of copper in organisms, numerous efforts have been undertaken to develop efficient and selective methods to assess copper ions in cells and organisms.

由于Janus-faced 在生物特性，为数众多的铜的努力开发效率，是进行选择性的方法评估和生物细胞内铜离子。

DSC-TGA thermal analysis and XRD characterization results demonstrate that Fe is precipitated as Fe3O4 during alkaline decomposition of jarosite. The contents of Fe, In and Zn in decomposition residue are 38.81%, 0.23% and 12.89%, respectively. After selective leaching of In and Zn with dilute HCl solution, the iron concentrates obtained from magnetic separation can be used as raw material for iron smelting.

DSC-TGA热分析和X射线衍射分析结果表明：在NaOH分解过程中，铁矾渣中的铁主要以Fe3O4形式沉淀入渣；分解渣中Fe、In和Zn的含量分别为38.81%、0.23%和12.89%；经稀盐酸选择性浸出铟和锌后，进一步磁选富集可作为炼铁原料。

They believed that one did not choose sexual orientation or feelings, but was overcome by them," says Jeffreys."

她们相信一个人不能选择性倾向或性感觉，而只能被它们征服。

Jervis has introduced the psychological concept of "perception" to probe into the impact of perception and misperception on international politics,thereby the "black box" of decision-making can be opened its working mechanism and procedure can be deciphered.

但是，由于决策者自身条件的限制，尤其决策的制定总是处于不确定的复杂条件下，决策者对环境和他人的判断常常是一个选择性知觉、错误知觉和知觉扭曲不断发生的过程，这就使情况变得更加复杂。

It was there that selective breeding was first successfully used to develop jet-black and, later,"silver" foxes.

正是在那儿首次成功采用选择性养殖方式，培育发展了油黑狐狸以及后来的"银白"狐狸。

Pyrolyzing the kenaf core s directly,a new kind of absorbent with superior selectivity and high sorption capacity to oil was obtained.

以红麻杆为原料，经热解处理制备出选择性亲油和高吸油量的吸油材料。

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％。