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.

youdao

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;

youdao

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.

youdao