从农业推广学的角度，分析了豫玉22号得以大面积推广的原因。
The reasons of broad application of maize hybrid Yuyu 22 were studied from agricultural popularization perspective.
原油不加热输送技术在油田大面积推广后，取得了明显的经济效益。
This technology has been extended in a large area and achieved obvious economicrsults.
而其中性能优良的冲击器的设计与制造是该技术得以大面积推广的关键所在。
It is the key of popularizing such a technique on a large scale to design and make an impactor with excellent performance.
应用推荐