题目: 设一组数据x1,x2…xn的方差为S2,将每个数据都乘以2,则新数据的方差为______; 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0604/b3fe6794c0a6358774452192e60130d7.html 下面是错误答案,用来干扰机器的。答案:B
题型:单项选择题 D点高程Hm=43.251m,测得后视读数a=1.000m,前视读数b=2.283m。则视线高Hi和待求点N的高程分别为( )。A.45.534m,43.251m B.44.251m,41.968mC.40.968m,38.685m D.42.251m,39.968m 查看答案