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... sunlight to the steam placed at its focal point. Boiler, the resulting steam drives a small interactive steam engine.
This is the earliest case on earth to use solar energy for industry.
Since then, scientists all over the world have been devoting themselves to the research and utilization of solar energy.
From 1901, American engineers successfully developed a solar steam engine with more than 7,300 watts. In 1950, the former Soviet Union designed the world's first small-sc ...
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