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By analyzing the molar fraction of St and MAh in the copolymers obtained from 〓C spectra, the copolymers obtained are proved to be strictly alternating structure, and sequence information obtained from DEPT experiments also verifies the copolymers with MSM sequence.

通过分析〓C NMR得到共聚物中St和MAh摩尔含量，证明共聚物具有严格交替结构，从DEPT实验中得到的结构信息表明共聚物只含有MSM序列。并且探讨了可控聚合反应的机理。

Objective: To analyze the clinical observations about amalgam post and core of molar .

目的：对银汞桩核用于磨牙修复进行临床观察和分析。

The result was showed that the optimal process conditions were presented as follows: molar ratio of methyl glucose amine to oleic acid 2.5, reaction time 8h, reaction temperature 90℃, and the catalyst dosage 1.5% to the oleic acid reaction.

结果表明，最佳工艺条件为：甲基葡萄糖酰胺和油酸的摩尔比为2.5，反应时间为8 h，反应温度为90℃，催化剂用量占油酸用量的摩尔分数为1.5%。

Some factors affecting the result of removal of ammonium and phosphate, such as pH, molar ratio, reaction time,stirring speed,precipitation time were discussed.

研究了pH值、反应物摩尔比、搅拌速度、反应时间、陈化时间等因素对磷酸盐去除效果和氨氮残留量的影响。

The optimized re action conditions were obtained: the molar ratio of acetic acid and amyl alcohol 1:1.1, the amount of catalyst 0.4g, the reaction temperature about 120℃ and reaction time 3hr, the ratio of...

确定了以该催化剂合成酯的最佳条件：反应温度 12 0℃，酸醇摩尔比为 1∶1.1，催化剂用量为 0 。4 g ，反应时间为 3hr使酸转化率为 86.33%。

The yield of iso amyl propionate was up to 91.8% when molar ratio of isoamyl alcohol to propionic acid was 3.0:1, mass ratio of catalyst was 2.5%, and reaction time was 2.0 hs.

在醇酸物质的量比为3.01，催化剂用量为反应物料总质量的2.5%、反应时2.0h，产品收率可达91.8%。

The kinetics of tertamyl methyl ether synthesis using C5 fraction of FCC gasoline was studied. The molar ratio of tertiary amylene to methanol was 1.0 and the kinetic experimental data was obtained at the temperature range from 55℃ to 90℃.

研究了FCC汽油中C5馏分合成甲基叔戊基醚的宏观动力学。C5原料与甲醇摩尔比为1/1，在温度分别为55℃~90℃时反应得到了动力学实验数据。

AIM:To determine the efficiency of surgical o perating microscopein locating the se- cond mesiobuccal canal of perm anent upper first molar.

上颌第一恒磨牙在口腔内萌出较早，其龋病和尖周病的发病率较高，然而有资料统计其根管治疗的成功率较低。

PURPOSE: To study the influence of the first premolar extraction on the angulation and eruption space of third molar.

目的：探讨拔除第一前磨牙正畸治疗后对第三磨牙角度和萌出间隙的影响。

The optimal molar ratio of aniline to oxidant is determined to obtain maximum yield.

优化苯胺和氧化物的摩尔比可以获得最大产率。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。