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1·Conclusion: There is much progress of study on digestive diseases in alte years.

结论：近年消化系疾病研究进展较大。

2·Considering above factors, detailed comparison of quarries in Longkou Water Control Project is carried out and the most optimistic alte...

考虑以上因素对龙口水利枢纽工程砂石骨料料源选择进行详细的比较，从而选择出经济合理的方案。