<正>A LM-4 B carrier rocket lifted off from the Taiyuan Satellite Launch Center at 11:23 Beijing time on September 27, launching two environmental monitoring satellites（HJ-2 A and HJ-2 B） into their preset orbits. The HJ-2 A and HJ-2 B, two optical remote sensing satellites, will replace the previous operating satellites HJ-1 A and HJ-1 B, providing services in the areas of environmental protection, natural resources, water conservancy, agriculture and forestry. 

【文章來(lái)源】：Aerospace China. 2020,21(03)

【文章頁(yè)數(shù)】：1 頁(yè)


本文編號(hào)：3204084