双

The mechanism was supposed as follows: polyfluoroalkyl iodides were initiated by sodium dithionite to give R〓 which was added to one double bond of diallylacetic acid, after the sequential radical cyclization and nucleophilic substitution to form bicyclo-lactones.

这是因为：多氟烷基碘化物在连二亚硫酸钠的引发下，得到自由基R〓，后者加成到二烯丙基乙酸中的一个—C=C—双键上，然后在碱性介质中进行分子内亲核反应得到双环内酯类产物。

The company occupies 50,000 square meters, total investment of 50,000,000 yuan, the introduction of an international leading level of dual-comb, double doffer, many messy straight Shop, three round drum Spunlace Materials hygiene production lines.

公司占地50000平方米，总投资5000万元人民币，引进具有国际领先水平的双梳理、双道夫、多杂乱、直铺、三圆鼓水刺卫生材料生产线。

Peripheral plasma membrane proteins extracted from the spermatozoa from caput,corpus and cauda epididymis as well as vas deferens were probed with four lectins—Arachis hypogaea agglutinin、Canavalia ensiformis agglutinin、Dolichos biflorus agglutinin、Triticum vulgaris agglutinin.The results indicated that the 104 and 95kD AHA binding glycoproteins,and the 117、114、104、87、76、70kD ConA binding glycoproteins were synthesized and modified in the testis;the 120 and 65kD ConA binding glycoproteins,and the 54kD DBA binding glycoprotein were modified or lost during epididymal maturation;the 109kD ConA binding glycoprotein,the 74、70、45kD DBA binding glycoproteins,and the 57kD TVA binding glycoprotein were modified during epididymal maturation.

结果表明：与花生凝集素结合的104kD和95kD糖蛋白，与伴刀豆凝集素结合的117、114、104、87、76、70kD糖蛋白在睾丸中已完成了蛋白合成及修饰过程；与伴刀豆凝集素结合的120kD和65kD糖蛋白，与双花扁豆凝集素结合的54kD糖蛋白在精子附睾成熟过程中被修饰成其它种类的蛋白或被丢失；与伴刀豆凝集素结合的109kD糖蛋白，与双花扁豆凝集素结合的74、70、45kD糖蛋白，以及与麦胚凝集素结合的57kD糖蛋白是在附睾中完成其修饰过程的。

This is because the bridge converts the double to a float, which is eventually converted back to a double.

这是因为桥将双精度数转换成了浮点数，最后又将浮点数转换成了双精度数。

The next bond is a double bond this happens when two pairs of electrons share.

第二种为双键，有两对共用电子对时则形成双键。

The surface displacement and deformation caused by the construction of double parallel tunnels is more complex than the single tunnel s.

城市中隧道常以双孔平行隧道的形式出现，而双孔平行隧道施工地表位移及变形比单孔的复杂，通常第二条隧道要滞后修建，所以当第二条隧道施工时，会对第一条隧道施工地表位移及变形产生影响，同时第二条隧道施工地表位移及变形也会受到第一条隧道的影响。

1 Overpass,the paper summarizes the double "S"complex linear in the course of the post-tensioning method ,the data computation and so on.

根据店集一号立交桥的施工特点，对后张法双"S"复杂张拉线形进行了总结，从科学和实践经验双重角度出发，采用先进的工艺、技术和合理的过程，使双"S"复杂曲线预应力张拉达到预期效果，为其他工程提供了经验参考。

But for GLONASS, the double difference equation contains the receiver clock parameter. This made the solving of integer ambiguity of double difference more complex.

对于GLONASS卫星，由于站星双差中含有接收机钟差项，使得双差模糊度的求解变得复杂。

Two single-row cups end one double cone; one double cup and two single-row cones.

两个单排杯结束1双锥；一个双杯和两个单排锥。

SZG series double cone rotating vacuum drier's main machine is double cone tank, let steam or heat water inside sealed jacket heat the inner shell in vacuum state, the hot transferred from inner shell to dump material, make water of the dump material gasify, low speed motor drying the tank along, make material up and down, from inside to outside, and change the heated surface, at the same time, vapour is taken out continually through vent-pipe of vacuum pump, increase the speed of drying, attain the purpose of uniformity drying at last, it is in conformity with the requirement of GMP.

SZG双锥回转真空干燥机主机为双锥形罐体，罐内在真空状态下，夹套内可通过内胆传递给湿物料，使湿物料中水分气化，低速电机带动罐体回转，物料不断上下内外翻动，更换受热面，同时，水蒸气通过真空泵经真空排气管不断被抽走，加快了物料干燥速率，最终达到均匀干燥的目的。符合药品管理规范"GMP"的要求。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。