三价

The results showed that different species of aloe and aloe different parts of ferric ion, divalent magnesium ion content has some differences.

结果表明，不同品种的芦荟及芦荟的不同部分三价铁离子、二价镁离子的含量有一定的差异。

It is to reduce Eu3+ into Eu2+ with electrolyzation method.

采用电解的方法将三价铕还原成二价。

In the same central heteroatom systems, the redox reactivity of the systems substituted by the trivalent metal is higher than the systems substituted by bivalent metal.

在中心原子相同的体系中，三价金属取代的体系比二价金属取代的体系氧化还原能力强。

Adding a certain amount of monovalent and trivalent cations is essential for improving ZnO varistors's characteristics.

一价离子、三价离子以及其它氧化物掺杂改性对于获得高性能压敏电阻也十分关键。

The traditional chromium plating has carried through according to the technology of Sargent.

由于Sargent电镀铬工艺存在阴极电流效率低，分散能力和深镀能力差，以及六价铬离子带来的对操作工人身体的危害和严重的环境污染等问题，近年来发展了三价铬电镀工作。

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。

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。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。