等环的

Archaeological findings onYu-Chan-Yan in Hu-Nan Province,and Xian-Ren-Dong in Jiang-Xi provinceindicate that the origin of the Chinese civilization has prominent features different from those of the Western world in the Mediterranean area.Theappearance of the three great technical innovations,agriculture,neolith and pottery tools,can be possibly traced back to 15000 years ago in China.

湖南玉蟾岩、江西仙人洞等考古发现表明，中国文明起源不同于环地中海地带的西方文明起源的一个显著特色，是农业、新石器、陶器这三大技术创新源头，有可能进一步上溯到近一万五千年前。

Mechanical parts of the original target ordinary screw, the drive motor and control components of the transformation, the transformation of the system after a stepper motor, ball screws and other components, form a open-loop control system.

机械部分主要针对原普通丝杠、驱动元件和控制电机的改造，改造后的系统采用了步进电机，滚珠丝杠等元件，构成了一个开环控制系统。

In recent years, the academic world and industry have cooperated in developing automated environmental controls to monitor and control the growing quality of the Phalaenopsis.

近年来学界与产业合作，在自动化环控对蝴蝶兰成长品质，以及研究花期调节技术等，投入很大的心力，也得到相当的成果。

Result A average positive rate was 21.55% of porcine contagious pleuropneumonia. And the mixed infection between porcine contagious pleuropneumonia and the other pathogens given above was confirmed.

结果］平均阳性率为21.55%，同时在被检猪中又进行了猪瘟、圆环病毒、蓝耳病、伪狂犬病、弓形体等疾病感染的检测，证实猪传染性胸膜肺炎与病毒性、细菌性、寄生虫性疾病有着不同程度的混合感染。

Presents the scheme of HVAC design of the project, especially the design and feature of its air conditioning system, points out that lack of fresh air, over high temperature inwinter, difficulty to make the best use of fresh air in transient seasons often occurred in buildings equipped with the primary air fan coil system.

概要介绍了北京东环广场工程和暖通空调总体设计方案，重点介绍写字楼部分的全空气空调系统设计及特点。指出写字楼惯用的风机盘管加新风做法存在新风量不足、冬季室温过高、过渡季难以充分利用新风等缺陷。

Effect of reaction parameters such as temperature, propylene pressure, time, catalyst amount etc.

考察了反应温度、丙烯压力、催化剂用量、反应时间等反应参数的影响，找到了较佳的丙烯环氧化反应条件。

Synthesis of target compounds namely: to vanillic acid as the starting material with methanol under reflux conditions for 4 - hydroxy -3 - p-methyl, then ether, and nitration, reduction, cyclization reaction 6 - methoxy -7 - benzyloxy-quinazoline -4 - one, and then by the chloride in place of aniline, benzyloxy-off, such as etherification reaction of the target compounds; target compounds with the second and third occurrence of substitution reactions of amines by the TM1, that is, 4 - amino-benzene -6 - methoxy -7 - [2 - hydroxy -3 -(N, N-diethyl amino) oxy c] quinazoline; with ether occurred Ornidazole reaction of TM2, namely, 4 - amino-benzene -6 - methoxy -7 - [2 - hydroxy -3 -(2 - methyl -5 - nitroimidazole) C oxy] quinazoline.

本论文以嘌呤类似物喹唑啉为母核，分别在其4位和7位引入结构多样的取代苯氨基和柔性侧链，设计了一系列4-取代苯胺基-6-甲氧基-7-(2-羟基取代丙氧基)喹唑啉类化合物。目标化合物的合成即：以香草酸为起始原料，与甲醇回流条件下得到4-羟基-3-甲氧基苯甲酸甲酯，然后经过醚化、硝化、还原、环合反应得到6-甲氧基-7-苄氧基喹唑啉-4-酮，然后再经氯化、取代苯胺、脱苄氧基、醚化等反应得到目标化合物；目标化合物与二乙胺发生胺取代反应得到了TM1，即4-苯氨基-6-甲氧基-7-[2-羟基-3-丙氧基]喹唑啉；通过与奥硝唑发生醚化反应得到TM2，即4-苯氨基-6-甲氧基-7-[2-羟基-3-(2-甲基-5-硝基咪唑)丙氧基]喹唑啉。

Benzyloxy benzoyldimethylsulfoxide was prepared by the reaction of ethyl 4-benzyloxybenzoate and dimethyl sulfoxide in the presence of sodium hydride, followed by Pummerer reaction with concentrated hydrochloric acid to afford eo-hydroxy-co-thio-methyl-(4/-benzyloxy) acetophenone, which reacted with urea, thiosemicarbazide, semicarbazide hydrochloride and o-phenylenediamine to give imidazolidine-2,4-dione, l,2,4-triazine-3- one and quinoxaline derivatives, respectively.

本文用4-苄氧基苯甲酸乙酯和二甲亚砜为原料，在氢化钠存在下反应，合成了(4′-苄氧基)-苯甲酰基-二甲亚砜。研究了该亚砜在浓盐酸的存在下发生的Pummerer重排反应，用重排产物ω-羟基-ω-甲硫基-(4′-苄氧基)-苯乙酮分别与尿素、氨基脲、氨基硫脲和邻苯二胺反应合成了2，4-咪唑啉-二酮、1，2，4-三嗪-3-酮、喹喔啉等含氮杂环化合物。

A telephone in which audible communication is established by use of a two-way radio transmitter and receiver .

头戴式受话器，耳机用头环套在耳朵上的用于接收电话、收音机或立体声等的接受器

This article developed a series of work on the model reactant.

围绕这一模型底物，从溶剂、反应时间以及反应添加物等几个方面对PET环合反应的条件进行了优化，得到了反应的最优化条件。

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。