hi, i m delia, from romania, and i have 2 months :D.my father it s land surveyor :D

hi, i m delia, from romania, and i have 2 months :D.my father it s land surveyor :D

首先对橡皮球弹跳过程进行一些理性化假设，设橡皮球是刚性的，质量为m，垂直下落碰击面是水平光滑的平面，在理想情况下碰击无能量损耗。-MY I HEIPU YUO MAY COM PUTEER

cad加载lsp源码。记忆移动功能（命令m）及记忆拉伸功能（命令n），可以自动记忆上一次移动或拉伸的数值，不用重新输入数字就可以按记忆数字移动或拉伸。-cad load lsp source. Mobile memory function (order m) stretch and memory function (command n), one can move or stretch the automatic memory value, without re-entering a numbe