二价

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。

But bivalent and trivalent metal salts of the phosphoric acid had little effect on properties of iPP.

而二价的钙盐、镁盐、锌盐和三价的铝盐的成核效果不明显。

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。

Iron in particles presents not only in trivalent compounds but also in bivalent ones, especially for samples collected in dust episode.

更重要的是，铁不仅以三价化合物存在，而且部分以二价化合物存在，特别是在沙尘暴期间。

A bivalent and trivalent metallic element of the rare earth group.

稀土属二价和三价金属元素。

Thress homologous chromosomes of trisomics associated as a trivalent or a bivalent and a univalent or three univalent during diakinesis and metaphase 1 ;Laggard chromosome and univalent separated in advance at anaphase I ,leading to distribution of 10-1-10,9-12,11-11,10-2-10,10-12,10-10,9-1-11 besides 10-ll;And there was distribution of 11-11-10-10, 10-10-10-12, 10-10-10-11, 10-11-11-11, 11-11-10-9, 10-10-10-10, 9-12-10-10, 9-9-11-11, 11-10-10-9, 12-10-9-11, 11-9-9-13, 10-10-10-9 at anaphase II ;n l microspore frequency were different of four trisomics.

三体在终变期和中期Ⅰ，3个同源染色体联会成三价体，或2个联会成二价体和1个单价体，或3个都为单价体；后期Ⅰ出现落后染色体或单价体提前分离，导致除10-11式分离外，还有10-1-10，9-12，11-11，10-2-10，10-12，10-10，9-1-11等不均衡分离方式；后期Ⅱ有11-11-10-10，10-10-10-12，10-10-10-11，10-11-11-11，11-11-10-9，10-10-10-10，9-12-10-10，9-9-11-11，11-10-10-9，12-10-9-11，11-9-9-13，10-10-10-9等分离方式；4个三体中的n 1小孢子频率不同。

The results indicate that the Sn on the catalyst is present in tetravalence, in alloy with platinum, and in divalence.

结果表明该催化剂中的锡主要有正四价锡、铂-锡合金和正二价锡。

Fe, Ni and Mn, in form of divalence, and Cr in form of trivalvence dissolve into solution.

蚀孔内发生金属的活性溶解腐蚀；Cr以三价离子，Fe，Ni和Mn以二价离子形式溶解；Fe，Cr的溶解量对孔蚀自催化效应有显著的影响。

To acquire iron, many plants reduce Fe to Fe in soil by ferric-chelate reductases, which is an obligatory process for the iron acquisition.

为了获取铁元素，许多植物都将三价铁还原为二价铁后再吸收，由三价铁还原酶参与的还原过程是植物从土壤中获取铁的限速过程。

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。