The global production network which seeks to identify the geographical spatiality involved in the network process of crossing African foods to UK.
全球生产网络，旨在识别将非洲食物运往英国的过程中所涉及的地理空间性的网络过程。
Genetic improvement by crossing was a main practice for more than 20 years in beef cattle production in China.
杂交改良是20余年来我国肉牛生产的主要实践。杂交是育种的方法之一。但它同正规的育种工作是有界限的。
The actuality of process and production of heel of 60at rail for railway switches and crossing was introduced, and the congener technology at home and abroad was summarized as well.
介绍了铁路道岔60at轨跟端加工生产工艺现状，国内外同类技术概况。
It is a very urgent problem to find male sterile lines of alfalfa that have fine genetic characters in seed production of crossing.
获得遗传性状优良雄性不育系是苜蓿雄性不育系应用在杂交制种中急待解决的问题。
This paper introduced the field selection, field planning, vane production, observation methods, and record format of river-crossing leveling in detail.
详细介绍了光学测微法跨江水准测量方法、场地选择、场地布设、砚板制作、观测方法、记录格式等内容。
This paper introduced the field selection, field planning, vane production, observation methods, and record format of river-crossing leveling in detail.
详细介绍了光学测微法跨江水准测量方法、场地选择、场地布设、砚板制作、观测方法、记录格式等内容。
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