二价的

In acid and alkali soil, there are mainly indissoluble bivalent or trivalent phosphates, which cannot be utilized by plants.

在酸碱性土壤中，磷主要以植物难以吸收利用的难溶性二价或三价阳离子的形式存在。

A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

一种二价或三价金属元素，坚硬的银白色铁磁体，植物动物营养中的微量元素。

Silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

一种二价或三价金属元素，坚硬的银白色铁磁体，植物动物营养中的微量元素。

The synthesis and characterization of 3,3'trimethylenedi indene and divalent rareearth 3,3'-trimethylenediindenyl complexes

3，3＇－三亚甲基二茚和二价稀土3，3＇—三亚甲基二茚基配合物的合成与表征

The cytogenetics of interspecific hybrids among the four cultivated cotton species were studied in this paper and results are as follows: The diploid interspecific hybrid (G. arboreum×G. herbacium) F〓 had a four-chromosome-ring at the meiotic metakinesis. The synapses of tetraploid hybrid (G. hirsutum ×G. barbadense) F〓 was found to be regular, which mainly formed bivalents, sometimes some univalents, multivalents and chromosome bridge.

四个栽培棉种间杂交种F〓的细胞学观察结果表明，F〓减数分裂中期Ⅰ，形成一个环状四价体，直接证明了亚洲棉与草棉之间存在一对相互易位；F〓减数分裂中期Ⅰ联会基本正常，主要形成二价体，偶尔出现一些单价体和多价体，以及染色体桥。

By Obtaining the absorption spectra of the metalloporphyrins at different potentials in deoxygenated solution and then following the spectra changes while the solution was being oxygenated, we were able to reveal the interaction of metalloporphyrins with O_2 at different valence states.

要了解金属大环化合物氧化还原型催化剂作用机制的一个重要问题，即是查明中心金属离子在什么价态下能与o：作用，以及相应价态的氧化还原电位。多数作者认为大环化合物中心金属离子为正二价M。

The amounts of iron bacteria in the distribution system water and the water from each treatment processes were determined by Most Probable Number and Plate Counts methods.

铁细菌一般生活于含氧少但溶有较多铁及二氧化碳的水中，能在氧化二价铁成三价铁化合物的过程中起催

The effect of three common hydro-chemical factors,such as univalent cation concentration(Na+ ion concentration),bivalent cation concentration(Ca2+ ion concentration) and pH value on clay particles releasing in sand column was studied through batch test.

通过批量试验，对一价阳离子浓度，二价阳离子等，浓度(Ca2+浓度)和pH值三个最常见水化学因素对砂柱中粘土颗粒释放的影响进行了研究。

An unsaturated fatty acid whose carbon chain has one double or triple valence bond per molecule; found chiefly in olive oil and chicken and almonds.

碳链的分子均有一个二价或三价键的不饱和脂肪酸，主要存在于橄榄油、小鸡和杏仁中。

An unsaturated fatty acid whose carbon chain has one double or triple valence bond per molecule; found chiefly in olive oil and chicken and almonds.

碳链的分子均有一个二价三价键的不饱和脂肪酸，主要存在于橄榄油、小鸡和杏仁中。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。