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Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

镧系元素属于周期表第六周期中ⅢB族，全部是固体金属，它们是镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥共十五种金属元素，它们的外围两层的电子均是5d16s2，而外围第三层的f轨道电子却从零增加到14个，所以外围电子结构为4f0－145d16s2，而使这些元素氧化数均为＋3，化学性质极为接近，提炼时很难分开，它们的矿石又大多是多种元素混在一起的，更增加提纯难度，它们的原子序数为57－71，核内质子数逐个增加，因而对核外电子引力也不断增强，使原子半径随原子序数Z增加而减小，这就使镧系元素收缩、离子半径也缩小，这也使得Zr和Hf，Nb和Ta、Mo和W等原子和离子半径都很接近、也决定了它们彼此性质类似，以致难以分离、也使第Ⅷ族中第五周期的钌、铑、钯和第六周期的锇、铱、铂在性质上极为相似，因而称这六个元素为铂系元素。

So far,a limited number of research papers are related to dynamic response of long-span flexible roofs.Gymnasium roof is a special topic of long-span flexible roof structures,a-nd it is important to study on wind load and gust loading factor in the field of engineering and research.

目前国内外对大跨度柔性屋盖的风振响应研究很少，本文研究的体育馆屋盖结构的风荷载及风振系数作为大跨度柔性屋盖结构的一个专题，具有重要的工程应用价值和学术研究意义。

It is shown that three classes of nD polynomial matrices admit this kind of general matrix factorization.

本文将给出三类满足这种矩阵分解的n维多项式矩阵。

The results of output energy and pulse widths and the three-dimensional distribution of far field facula under different conditions were given.

报道了在ND：YAG激光器上利用受激布里渊散射补偿腔内插入用HF轻度腐蚀的普通薄玻璃片模拟激光棒表面的损伤而引起的相位畸变，实验给出了不同参数条件下的输出能量、脉冲和远场光斑的三维分布情况。

Nd Portia is lucky to be bestowed with a kind, wise and rich father who sets up a rule for her after he is dead.

看完碟，打开电脑和朋友聊天，用的是一种叫 skype 的聊天工具。

In the e nd, the specific implementation of missile control federate based on VRˉLink was given. This method is featured with high engineering value.

最后给出了基于 VRˉLink的导弹控制联邦成员的具体实现方法，具有很好的工程实用价值。

And about once a month I go ferreting through there to nd the receipt that I didn't think I'll ever need again but I suddenly need and it's extremely handy.

现实世界里这个也一样奏效！可能每个月能有一次，我得去找我曾经觉得我不会再用到，但现在又很急用的收据之类。

We wake up to fi nd that we were dear to each other.

我们醒了，却知道我们原是相亲相爱的。

Finally, do fi nd out what environment works best for you to write in.

最后，要知道什么样的环境最适合你写作。

And if we can't fi nd them, we can only pray they find us.

如果我们没找到，就只能祈求他们来找我们。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。