The toxicity of chromium in different valent are quite different.

不同价态的铬具有不同的毒性。

In the disappearing existence sentences, the verbs must be mono-valent ones.

隐现句中的动词只能是一价动词。

The results show that: both ultrasound and zero-valent iron can degrade P-nitrochlorobenzene.

结果表明，超声波和零价铁都可使对硝基氯苯得到降解。

The progress in linear chain clusters of low-valent platinum group metals is briefly reviewed.

本文就有关线性低价铂系金属簇合物的研究进展作一简述。

Our interest is to investigate reductive coupling reactions induced by low-valent titanium reagent.

这种试剂被广泛应用于分子内和分子间的还原偶联等反应。