目的了解元宫环、吉尼环、爱母环在农村推广的可接受性、效果和成本。
Objective To evaluate acceptance, cost and effectiveness ratios of three kinds of intrauterine device(IUD): Yuangong IUD, GyneFix IUD and MCu IUD applied in rural areas.
初步构效关系表明，反-4-苯乙烯基吡啶母环上的吡啶基是活性必须基团；
The structure-activity relationships of these compounds indicated that pyridyl group on the 4-styrene pyridine ring was necessary for the activity;
具有高含量的C27甾烷、规则甾烷、4-甲基甾烷、长链三环萜烷，说明它们母质主要为菌藻类；
High amounts of C27 steranes, regular steranes, 4-methyl steranes, long chain tricyclic terpanes for the western Qaidam oils indicate that the dominant organic matter source is algal material.
这里有只扫脸乌头挺好，是个母的，估计能出墨环。
There are only very good sweep face Aconitum, is a female, to estimate the Mexican ring.
采用双环电化学动电位再活化法(EPR法)研究316l奥氏体不锈钢扩散连接试样与母材的晶间腐蚀行为。
Intergranular corrosion for diffusion bonded joints and base materials of 316l stainless steel was investigated by double loop EPR test.
它由公扣和母扣组成，公扣的外周设有安装环槽，公扣的一端设有凸出部；
The periphery of the male buckle is provided with an installing ring groove, and one end of the male buckle is provided with the bulge.
文章分析了高强度X80钢管道的热影响区的软化、焊缝金属与母材的匹配及产生焊接裂纹的可能性，介绍了管道环缝焊接工艺，还列举了国外X80钢管道的焊接工程实例。
This paper analyzes the welding performances of the pipeline steel X80 including softening of heat affected zone, its matching with base material and the possibility of welding cracking. It also de…
文章分析了高强度X80钢管道的热影响区的软化、焊缝金属与母材的匹配及产生焊接裂纹的可能性，介绍了管道环缝焊接工艺，还列举了国外X80钢管道的焊接工程实例。
This paper analyzes the welding performances of the pipeline steel X80 including softening of heat affected zone, its matching with base material and the possibility of welding cracking. It also de…
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