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苏联正在研究用集聚太阳能焊接金属的方法是:射到地球的太阳光束几乎是相互平行散射,角度均为32′。采用相应的光学系统,可将此种光束集聚,密度为1000
The Soviet Union is studying ways to weld metal with concentrated solar energy: the sun’s rays that hit the Earth are scattered almost parallel to each other at angles of 32 ’. With the appropriate optical system, this beam can be concentrated at a density of 1000