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1·A cotton mutant, R1098 with the trait of resistance to glyphosate, was obtained by the method of somatic cell inducing and continued directional selection.

采用体细胞连续定向筛选技术，结合体细胞诱变技术，获得非转基因抗草甘膦的棉花突变体—r 1098。

2·Our school has provided the graduates with employment information, and recommended the best fit for the job, based on the principle of dual - directional selection.

学校为毕业生提供就业信息，本着双向选择的原则，择优推荐工作。

3·This paper briefs the long borehole directional drilling technology, selection of typical equipment, process, measuring system and application in coalmines.

本文介绍深孔定向钻进技术的原理、典型的设备选择、工艺、测量系统以及该技术在煤矿工程中的应用。

4·This paper briefly introduces the design of SDQ-91 directional coring apparatus, selection of SDQ-91 borehole measuring instrument and its improvement.

介绍了SDQ - 91型随钻测量定向取心钻具的特点、定向取心器的研制、随钻测量仪的选型与改进等。