价

It has been suggested that Cr may be a component of glucose tolerance factor in vivo.

六价铬和三价铬，作为环境中存在的同一种元素的不同形态，对人类却有着不同的影响。

Topological indexes of A , B , C and D were all obtained from the different combination of topological vertex degree. A QSAR equation for this series of compounds was established based on the multi-linear regression method and a new group of autocorrelation topological indexes. The results showed that the biological activity is linearly correlated with the volume and branching size of the quinclorac derivatives. Finally, new herbicide was designed based on all QSAR results.

针对应用经典结构参数和量子化学参数得出的结果不够理想的问题，对点价自相关拓扑指数进行了研究，建立了一组新型的点价自相关拓扑指数A、B、C、D；首次将该指数用于除草剂氯喹酸酯类化合物的定量构效关系研究中，建立了很好的定量构效关系方程，综合分析所有的QSAR结果设计出了潜在的新型除草剂氯喹酸烯丙酯。

Recently, beijing of manager of 45 steel look forward to can search steel price closely to stop drop effective prescription because an urgent announcement, the sale of look forward to of 45 steel of countrywide deputy always travel-stained hurry to Beijing, hard look for lets steel price stop drop effective prescription.

近日，45家钢企老总北京密会寻钢价止跌良方因为一份紧急通知，全国45家钢企的销售副总风尘仆仆赶到北京，苦苦寻觅让钢价止跌良方。

We studied trivalence chromium ion electrode reaction on three different surface state by cyclic voltammetry, discussed electrode activation influence on electrode reaction, and analysed the mechanism of electrode reaction. We discussed current efficiency during the first charge process and charge/discharge cycle performance by invariable current charge method.

应用循环伏安法考察了三价铬离子在三种不同表面状态石墨电极上的电极反应，探讨了电极表面活化处理对三价铬离子的电极反应的影响，并分析了电极反应的机理；采用恒电流充电的方法探讨铬液流电池初次充电过程的电流效率及恒电流充/放电循环的性能。

Doped high consistence Co can't increase the density of defect levels. ZnO doped Fe is different from doped Mn or Co totaly, the density of photoelectrons anddefect levels aren't reduced obviously. It's probably related the valence of Fe in crystal,general think trivalence of Fe, and form donor levels in ZnO.

Fe掺杂的ZnO完全不同于Mn、Co掺杂，其光生电子密度没有因掺杂出现明显的降低，即缺陷能级密度没有降低，这可能和掺入ZnO所呈现的价态有关，一般认为Fe为三价态，在ZnO中形成施主能级。

The trivalent chromium plating has been proposed for a long time.

实际上提出用三价铬代替六价铬的研究已经有很长时间。

Hexavalent chromium is the most toxic form, the toxicity of trivalent chromium than 100 times.

六价铬是毒性最大的形态，其毒性比三价铬高100倍。

Causes for the formation of hexavalent Cr in trivalent Cr electroplating process were analyzed.

分析了三价铬镀铬过程中产生六价铬的原因。

In order to mimic the function of Tyr in OEC, tyrosine-attached complexes 15～18, 18 werealso synthesized.

通过同样的方法确定了锰化合物16、18的价态为Mn，而化合物18'的价态为Mn。

Or or relating to salts or acids forming salts with two atoms of a univalent metal.

含有两个一价金属原子的盐类或酸类的，或者有关盐类或酸类的，它通过两个一价金属原子形成盐类

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。