Long March Launch Vehicles Promote Quick and Sound Development of Satellite Applications

INTRODUCTION Launch vehicles are a precondition and main carrier for space activities for human beings.Their development have directly promoted the technology of satellite applications,manned spaceflight,deep space exploration,and promoted the development of communication,navigation,environmental monitoring,resource exploitation,scientific research and so on.

我国速冻食品的现状及其发展前景

系统介绍了速冻食品的特点、种类和在我国的发展现状、发展前景,并针对存在的问题,指出了我国速冻食品今后开发研究的方向。