In order to reduce the expansion stress resulting from cement's expansion and prolong the life-span of porcelain insulator, a thin asphalt buffer layer is coated between the porcelain and the cement.
为了降低水泥膨胀所引起的膨胀应力，延长瓷绝缘子的使用寿命，在胶装时一般在瓷体和水泥之间涂一层沥青缓冲层。
Urban expansion and its driving forces in Chengdu city was quantitative analyzed by methods of buffer analysis and factors analysis based on TM data and GIS spatial analysis techniques in the paper.
本文利用多时相tm影像，基于GIS空间分析技术，运用缓冲区分析方法和因子分析方法，对成都市城市扩张及其驱动力进行了定量分析。
Urban expansion and its driving forces in Chengdu city was quantitative analyzed by methods of buffer analysis and factors analysis based on TM data and GIS spatial analysis techniques in the paper.
本文利用多时相tm影像，基于GIS空间分析技术，运用缓冲区分析方法和因子分析方法，对成都市城市扩张及其驱动力进行了定量分析。
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