二价

Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.

酰亚胺源自氨的一种化合物，含有与一个二价酸基或者二个一价的酸基结合的氨基

The soluble tetra-alkyl phthalocyanine compounds have the following general structure, wherein Rn represents straight-chain or branching chain alkane, n represents the number of straight-chain or branching chain alkane, M represents center ligand of bivalence or more, L represents axial ligand, X represents the number of L.

该可溶性四烷基酞菁化合物符合如下结构通式：结构通式中，Rn代表直链或支化链的烷烃，n代表直链或支化链的烷烃的数目，M代表二价或二价以上的中心配体，L代表轴向配体，X代表L的数目。

There are nine bivalents in pollen mother cells at late diplotene or early diakinesis, and the homologous chromosomes essentially arrange on the equatorial plate at late metaphase Ⅰor early anaphase Ⅰ, then the two homologous chromosomes of each bivalent separate from each other and move to two opposite poles drawn by spindle fibers.

在减数分裂双线期末或终变期初，可以观察到9个二价体，在中期I末至后期I初，同源染色体基本排列在赤道板上，然后在纺锤丝的牵引下二价体的两条同源染色体分开，分别移向两极，每一极有9条染色体，从而确认该属植物的染色体基数为x=9。

The effect of ferrous iron on the leaching rate of gallium and phosphorus was not significant.

镓和二价铁离子的沉淀率随磷酸根离子浓度的增加而增加，当磷酸根离子与金属离子摩尔比大于1：1后，磷酸根离子浓度对沉淀率的影响不再变化；温度对镓离子沉淀过程的影响较小，对二价铁离子的沉淀过程影响较显著。

Results showed that the PMC meiosis of autotetraploid was similar to the diploid except some particularities. In metaphase Ⅰ, multivalent, quadrivalent, trivalent, bivalent and univalent were observed and some of the chromosomes were found not to rank on the metaphase plate and so did in metaphase Ⅱ cells. In anaphase Ⅰ and anaphase Ⅱ cells, there were lagging chromosomes, chromosome bridge and fragment. During anaphase Ⅱ and telophase Ⅱ, chromosome segregation was not synchronous or equal. At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared.

结果表明，同源四倍体花粉母细胞减数分裂过程与二倍体相比，中期Ⅰ染色体构型复杂，有多价体、四价体、三价体、二价体和单价体；中期Ⅰ及中期Ⅱ有部分染色体没有排列在赤道板上；后期Ⅰ及后期Ⅱ出现落后染色体、染色体桥及断片；后期Ⅱ和末期Ⅱ有染色体不同步分离及不等分裂的现象；四分体时期还出现二分体、三分体、含微核的异常四分体及多分体。

In the research of the valency of modern Chinese verbs, the two-valence transitive verbs are difficult. That's because the quality of this kind of verbs is huge, and various in style. It's difficult to summarize the overall characteristic.

在现代汉语的配价研究中，二价动词的研究是一个难点，主要是因为二价动词数量庞大，种类繁多，因此不容易总结出总体特点。

The amount of Na(superscript +), NH4(superscript +), K(superscript +), Mg(superscript 2+), Ca(superscript 2+), Zn(superscript 2+) in fruits and juice (sports water, green tea , pear juice, carrot juice and carrot and orange juice) were respectively separated and detected by non-suppressed ion chromatography. And pyridine-2, 6-dicarbexylic was used as mobile phase to separated monovalent cations and pyridine-2, 6-dicarbexylic-ethylenedi-amine-oxalic acid was used as mobile phase to separated divalent cations.

采用非抑制型离子色谱法测定了水果以及饮料（运动型饮料、绿茶、水蜜桃汁、胡萝卜汁和胡萝卜橙汁）中Na、NH4、K、Mg(上标 2+)、Ca(上标 2+)、Zn(上标 2+)的含量，其中一价阳离子以吡啶－2，6-二羧酸为淋洗液测定，二价阳离子以吡啶－2，6-二羧酸+乙二胺+草酸为淋洗液测定。

The amount of Na+, NH4+, K+, Mg2+, Ca2+, Zn2+ in fruits and juice (sports water, green tea , pear juice, carrot juice and carrot and orange juice) were respectively separated and detected by non-suppressed ion chromatography.

采用非抑制型离子色谱法测定了水果以及饮料(运动型饮料、绿茶、水蜜桃汁、胡萝卜汁和胡萝卜橙汁)中Na+、NH4+、K+、Mg2+、Ca2+、Zn2+的含量，其中一价阳离子以吡啶-2，6-二羧酸为淋洗液测定，二价阳离子以吡啶-2，6-二羧酸+乙二胺+草酸为淋洗液测定。

However, there is no such restriction on the transformational forms, such as the Dative Construction in English and the sentence marked by "ba" in Chinese. The differences are: Chinese DOC has a more wide-ranging scope; Some verbs used in the Chinese DOC sentences are inherently one or two-place, but verbs used in the English DOC is at least inherently two-place, can't be one-place; some verbs bearing the same meaning can construct a DOC sentence in Chinese but not in English, and vice versa; there are differences on the form, the position and the ellipsis of the double objects; there are differences on the passive form of the DOC in both languages.

其不同点有：汉语的双宾结构范围更广；汉语中有的动词可能是一价或二价，但英语中的动词起码是二价，不可能是一价；有些具有相同意思的动词在汉语中可以构成双宾结构，在英语中则不能；反之亦然；在英汉语中，间接宾语和直接宾语的构成、省略及位置上都存在差异；英汉语的双宾结构的被动式形式存在差异。

The formal potentials in cyclic voltammograms of these 3+ valence complexes are followed: Co〓-TPPS (-0.08V )＞Fe〓TPPS (-0.14V)＞Mn〓-TPPS (-0.23V). The electrochemical reaction of Mn〓-TPPS is reversible, and both of Co〓-TPPS and Fe〓-TPPS are quasi-reversible. The standard heterogeneous rate constants of Co〓-TPPS and Fe〓-TPPS were determined to be 1. 4×10〓cm/s and 1.4×10〓cm/s respectively. The rates of electrode reaction are as followed: Mn〓-TPPS＞Co〓-TPPS＞Fe〓-TPPS, e.i. Mn〓-TPPS is the most easily oxidized by the dissolved oxygen, and Fe〓-TPPS is oxidized slower than Co〓-TPPS. Ni〓-TPPS can not be oxidized. It is considered that oxygen plays an important role in the valence change of central metal atom and the rate of electron transfer in some metalloporphyrins.

三价金属卟啉络合物在循环伏安图上可得到三价到二价的还原和氧化响应，电极电位从大到小排列为：Co〓-TPPS(-0.08V)＞Fe〓-TPPS(-0.14V)＞Mn〓-TPPS(-0.23V)，电极反应可逆性也不相同，Mn〓-TPPS是可逆过程，Co〓-TPPS、Fe〓-TPPS是准可逆过程，实验测得Co〓-TPPS的标准电极反应速率常数ks＝1.4×10〓cm/s，Fe〓-TPPS的ks＝1.4×10〓cm/s，电极反应的速率从大到小为：Mn〓-TPPS＞Co〓-TPPS＞Fe〓-TPPS，即Mn〓-TPPS最容易被溶解氧所氧化，Fe〓-TPPS被氧化的速度最慢，Ni〓-TMPyP不能被氧化，因此我们认为溶解氧对金属卟啉中心离子的价态和电子转移速率起着重要作用。

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。