It is shown that the service life is prolonged, yields of steam and hydrochloric acid are increased, overhaul charge is decreased and better economic benefits are obtained by the improvement.
经实际应用证明，此项改进延长了余热锅炉使用寿命，提高了低压蒸汽产量和合成盐酸产量，减少了检修费用，取得了较好的经济效益。
By the operation of two years, its better economic and social benefits are obtained.
经过了两年的运行，取得了较好的经济效益和社会效益。
Up to 1990 China has launched and recovered successfully12returnable satellites and obtained better social and economic benefits.
到1990年，我国已发射成功和回收了12颗返回式卫星，取得了比较好的社会效益和经济效益。
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