The properties, production process and research progress of allantoin are introduced and application of the products is reviewed. The developing prospect is forecasted.
介绍了尿囊素产品的性能、生产工艺及研究进展，并对产品的应用进行了概述，对发展前景进行了展望。
This paper describes geodetic instruments progress in 40 years and inquiries about developing prospect of geodetic instruments in our country.
阐述了40年来我国大地测量仪器的进展，并探讨了它的发展前景。
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