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。
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。
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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