祝贺《大氮肥》创刊２０周年匡永泰（中国石化总公司，北京，１０００２９）为加速我国农业发展，改变化肥依赖进口的局面，７０年代我国引进建设了１３套大化肥装置。为加快消化吸收引进技术，总结交流经验，推进技术进步，尽快使这批装置的技术和管理达到国际同类装置水... Congratulations on the 20th Anniversary of the First Issue of “Big Nitrogen Fertilizer” Kuang Yongtai (China Petrochemical Corporation, Beijing, 100029) In order to speed up the development of agriculture in our country and change the situation of dependence on imports of chemical fertilizers, 13 large-scale fertilizer plants were introduced in our country in the 1970s. To speed up the digestion and absorption of imported technology, sum up the exchange of experience, promote technological progress, as soon as possible to enable these devices to install the technology and management of similar devices ...