建模命令 /clear/prep7!===草图1====k,1,0,0,0 !生成关键点k,2,0,8,0k,3,70,8,0k,4,70,28,0k,5,150,28,0k,6,150,20,0k,7,80,20,0k,8,80,0,0!===========a,1,2,3,4,5,6,7,8 !生成一个面vrotat,1,,,