Sliding steel sleeve at the lower end of rubber barrel is used to make reasonable force arrangement for downhole packer meanwhile the expandable pressure of rubber barrel is decreased.

胶筒下部钢套采用滑套式，在降低胶筒扩张压力的同时，使封隔器在井下受力更合理。

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In the end the authors make a practical evaluation for the tourism environmental quality in Nanjing and Suzhou. The result shows that the method is reasonable.

文章最后对南京、苏州两市的旅游环境质量进行了综合评价与比较，其结果显示了该方法的合理性。

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