Student persistence rate is not only related to distance education institutions to run the social and economic benefits as well as the reflection of their teaching and management level.
学生保持率的高低，不仅关系到远程教育机构办学的社会和经济效益，也是其教学水平和管理水平的反映。
Adjusting process parameters can make the decomposition rate of complex ore increase (4-5) %, which is of obvious economic and social benefits.
通过调整工艺参数，要使疑难矿的分解率提高(4 ~ 5)%，具有明显的经济效益和社会效益。
Practice has proved that this kind of technology can obviously improve the lump coal rate, increase the security of constructing, have better economic and social benefits.
实践证明，这种技术可以明显提高块煤率，提高产量，增加施工的安全，具有较好的经济和社会效益。
Practice has proved that this kind of technology can obviously improve the lump coal rate, increase the security of constructing, have better economic and social benefits.
实践证明，这种技术可以明显提高块煤率，提高产量，增加施工的安全，具有较好的经济和社会效益。
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