查询词典 SN

All of these three metallogenetic series can be merged as one group of metallogenetic series, i.

其中，湘桂成矿单元有：Ⅰ-燕山早期中酸性花岗岩类有关的W、Sn、Sb、Pb、Zn矿床成矿系列：Ⅱ-燕山晚期酸性花岗岩类有关的W、Sn矿床成矿系列：Ⅲ-燕山早期构造-热事件有关的Au、Ag、Cu、Pb、Zn矿床成矿系列。

Sn powder of micronmeter in particle size, Li grease anti VG32 oil were mixed so that a Sn-based semiliquid grease were prepared and used as a new kind of lubricant for steel-copper tribo-pair. Friction tests were earned out on a modified model MS-800 4-ball Lester.

采用微米级锡粉与Li基脂、VG32号油混合制备出锡基半流体脂，在改进后的MS-800型四球式摩擦磨损试验机上，对锡基半流体脂润滑下的钢－铜摩擦副进行摩擦试验。

LB technique and atomic force microscopy were used to study the effect of 1,2-dioleoy-sn-glycero-3-phosphocholine, 1,2-dioleoy-sn-glycero-3-phosphoethanolamine and ceramide on the structure of sphingomyelin/Cholesterol LB bilayers.

用LB技术和原子力显微镜研究了1，2-二油酸甘油－3-磷脂酰胆碱、1，2-二油酸甘油－3-磷脂酰乙醇胺和神经酰胺对鞘磷脂/胆固醇结构的影响。

According to the H NMRstudy, it was found that the protons on the cyclopentadienyl ring of 〓 were not splitted, but when one proton on the cyclopentadienylring was substituted by methyl, that is in〓 complexes, thefour protons on the ring were splitted into four groups,the 〓 between the onesignal and the others is large, the total splitting is over 2ppm. The splittings werealso affected by the halides linked with the titanium, they increase according to theorder of CI, Br, I. By the study of the 〓 Sn NMR, it is found that the chemicalshifts of 〓 are present in low field. It is assume that the large space strain causesthe angles of the tin linked with ligands deviate from the normal tetrahedral anglesresults low field shift for 〓Sn. And by MS study,there were no molecular ions for 〓 complexes in the spectra. However, for 〓 when X=CI,Br,NCO and Ar is tolyl or phenyl group,there were molecular ions,but theirabundances were very small,and no that for the iodide was found.

钛上的卤素对茂环氢的裂分也有影响，依〓，Br，I顺序，卤素对茂环氢的裂分依次加大；通过对〓的研究发现，以上这些化合物〓的化学位移都出现在低场，认为大的空间张力造成的锡的键角偏离正常的锡的四面体键角是造成〓化学位移出现在低场的原因；对这些化合物质谱的研究发现，〓系列化合物得不到分子离子峰，而〓系列的化合物，当X=〓，NCO和苯环上不带取代基或只带甲基时，则出现分子离子峰，但丰度很低，而相应的碘化物和其它化合物则没出现分子离子峰。

There are no changes in development directions of maxilla,mandible and SN before and after orthodontic treatment for bimaxillary protrusion抯 adolescents with four premolars extracted,but there are different in development rate,the development of mandible is the fastest, maxilla is slower, SN is the slowest.

可以认为青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的生长方向在治疗前后无变化，但三者的生长速度不同，下颌骨生长最快，上颌骨较慢，前颅底的生长速度最慢。

There are no changes in development directions of maxilla,mandible and SN before and after orthodontic treatment for bimaxillary protrusion抯 adolescents with four premo－lars extracted,but there are different in development rate,the development of mandible is the fastest, maxilla is slower, SN is the slowest.

可以认为青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的生长方向在治疗前后无变化，但三者的生长速度不同，下颌骨生长最快，上颌骨较慢，前颅底的生长速度最慢。

The results indicated that the Sn atom in bistin Schiff base complexes was five-coordinated in trigonal bipyramidal geometries thanks to the existence of intermolecular ligands of Sn←N.

Schiff碱具有良好的配位作用，它们与不同的有机锡化合物配位后可以形成形式多样、结构不同的配合物，而且Schiff碱具有多种生物活性，与有机锡化合物生成配合物后，配合物的生物活性可能更宽广。

The endocyclic Sn atoms exist in a distorted triginal bipyramidal geometry with the coordination number of 5. The exocyclic Sn atoms form 6 significant bonds and exist in a distorted octahedron geometry.

化合物12的X衍射单晶测定表明，化合物是以Sn2O2四元环为中心的中心对称二聚体结构、内环锡为5配位的畸变三角双锥结构、外环锡为6配位的畸变八面体结构。

In addition, the surface and bulk species of electrochemically Li-deintercalated LiCoO〓 cathode is characterized by XPS.

反应的结果是SnO〓最终被还原为Sn和Li-Sn合金，伴随产物是Li〓O。这一不可逆过程是造成第一周循环时放电容量损失的主要原因。

Experiments show that the formation of tertiary dendrite depends strongly on the alloy type and alloy content. It is hard to form tertiary dendrite for hypoeutectic but easy for hypereutectic.

试验表明，三次枝晶的形成强烈依赖合金类型和合金成分，亚共晶的Pb-Sn合金很难形成三次枝晶，而过共晶的Pb-Sn合金则易于形成三次枝晶。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。