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爱好钻研太阳灶技术的农民赵增会投资150元,利用庭院间隙浇铸了8个太阳灶壳水泥模,生产重量为75kg,采光面积2m~2,焦距为80cm,热效率为65％的太阳灶。投产3
Chao Zenghui, a farmer who likes to study the solar cooker technology, invested 150 yuan to cast 8 solar cooker cement molds with the gap between the courtyards to produce a solar cooker with a weight of 75kg, a lighting area of 2m ~ 2, a focal length of 80cm and a thermal efficiency of 65%. Put into operation 3