将圆定义为一个基类，圆柱体定义为圆的派生类，分别求圆的面积和圆柱体的表面积和体积-Will be defined as a circular base class, defined as a round cylinder derived class, respectively, for a round cylinder size and the surface area and volume
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001300s ]
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SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001131s ]
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SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001429s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 69254 [ RunTime:0.004057s ]
