自1970年4月24日我国发射成功第一颗人造地球卫星以来,迄今已先后发射成功了22颗。目前我国卫星的生产、发射已达到每年8～10颗的能力,积累了相当丰富的经验。我国在利用卫星进行科研方面已取得了十分可喜的成就。198 7r年8月、9月,我连续地入轨了两颗返回式试验卫星,星上做的材料加工试验得到了火炬状的砷化镓单晶体,晶体的完整性和纯洁性有较大的提高;在生物方面,在空间试验过的谷物、蔬菜、花卉、药用植物和 Since the successful launching of the first man-made earth satellite in our country on April 24, 1970, 22 have been successfully launched so far. At present, the production and launch of satellites in China have reached the capacity of 8 to 10 stars per year and have accumulated a wealth of experience. My country has made very gratifying achievements in the use of satellites for scientific research. 198 In August and September of the seventh year, I continuously tracked two returning test satellites. The materials processing experiments conducted on the stars obtained the flare-shaped gallium arsenide single crystal. The crystal integrity and purity were greater In biology, cereals, vegetables, flowers, medicinal plants and plants tested in space