冠的

In the presence of NaH and in DMF, the acyclic crown ethers 1a and 1b were synthesized by the reaction of di-or triethyleneglycol ditosylate and o-methoxymethoxybenzyl alcohol, which was obtained from salicylaldehyde via the protection of the hydroxyl group with chloromethyl methyl ether followed by the reduction of the formyl group with NaBH4. The hydrolysis of 1a and 1b with dilute hydrochloric acid provided the diphenolic type acyclic crown ethers 2a and 2b respectively in good yield.

将水杨醛与碱和氯甲基甲基醚反应，再经过NaBH4还原，即制得邻苯甲醇，然后将其在DMF中与NaH和二甘醇二对甲苯磺酸酯反应，得开链冠醚1a和1b.1a和1b经稀酸水解，即脱保护而分别生成新的酚型开链冠醚2a和2b。

The lower first molar moved and rotated to distal, the mesial rotate to buccally and the distal rotate to lingually.

5的移动趋势是袷向伸长，冠向近中根向远中倾斜，冠舌向根颊向转矩，且整体受力较小。

It starts from the Department of aortic left coronary sinus ostium and the right coronary sinus ostium were issued for the left - coronary artery and its branches and right coronary artery and its branches, along the surface of the heart from the left and right respectively, extending toward the apex.

它从主动脉起始部的左冠窦口和右冠窦口分别发出左冠状动脉及其分支和右冠状动脉及其分支，沿心脏表面分别从左侧和右侧伸向心尖部。

The extraction of scandium picrate by benzo-15-crown-5 (B15C5) and dibenzo-18-crown-6(DB18C6) has been studied.

研究了苯并15冠5(B15C5)和二苯并18冠6(DB18C6)萃取苦味酸钪的萃取平衡。

Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.

目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。

The spherical cap harmonic modelsof the geomagnetic reference field in the region are calculated also.

球冠极的空间位置坐标为39.5°N和117.0°E，球冠半角为4°。

The introduction of whitecap-covered percentage and its relations with effective dielectric constant and depth of whitecap make physical model press close to realism.

在这个物理模型下，白冠层的有效介电常数可通过白冠覆盖率及其厚度与风速联系起来，使理论模型更贴近于现实。

Results: Most of ligaments of the occipito-atlanto-axial joints can be identified on sagittal planes, however, the transverse atlantal ligament on axial plane, the alar ligament on oblique coronal and axial plane, can be clearly demonstrated.

结果：寰椎横韧带在横断位和矢状位，翼状韧带在斜冠状位和矢状位，齿突尖韧带在矢状位和斜冠状位能清楚观察各韧带的形态和毗邻关系。

In the canine heart, coronary sinus musculature is continuous with right atrial myocardium at ostium and its connection branch inserts into left atrail myocardium distally, which forms a predominant conduction pathway between two atria in inferior atrial area.

大体心脏电生理证实，冠状窦内存在一条较为稳定的左右心房间电传导通路，该通路一端连接左房后壁，一端在冠状窦口与右房心肌相连。

Three kinds of optically active pnthalocyanine derivatives modified with chiral 2'-methyoxy-1,1'-binaphthyl; chiral binathyl crown ether; chiral 6,6'-didodecyl- 1,1'-binaphthyl crown ether, have been synthesized and characterized, respectively.

本论文以手性联萘、手性联萘冠醚、冠醚等功能性基团为化学修饰基元，分别合成了三类光学活性酞菁衍生物和两类共轭聚合物，对它们的组装行为以及某些光、电功能性进行了研究。

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。