【简答题】求解整周未知数时,搜索法的基本思想是:以数理统计理论的_____和______为基础,充分利用初始平差的解向量(站点坐标及整周模糊度的实数解)及其精度信息(方差与协方差阵和单位权中误差),确定在某一个置信区间,整周模糊度可能的整数解的组合,然后依次将整周模糊度的每一个组合作为已知值,重复地进行平差计算,其中能使估值的验后方差(或方差和)为最小的一组整周模糊度,即为所搜索的整周模糊度的最佳估值。
【单选题】Patents, said Thomas Jefferson, should draw 'a line between the things which are worth to the public the embarrassment of an exclusive patent, and those which are not'. As the value that society place...
A.
Patent offices have been too lax in granting patents.
B.
Most patent offices are swamped by applications.
C.
It is probably inhibiting, rather than encouraging, commercial innovation.
D.
The quilt of national patent offices and languages
【单选题】现在的苏州在历史上曾用过姑苏、苏州之名,正式使用苏州始自( )。
【单选题】现在的苏州在历史上曾用过姑苏城、苏州之名,正式使用苏州始自()。
【单选题】According to Paragraph 4, to 'draw a line under the past' is to______.
A.
teach its lessons to the next generation
B.
defend themselves morally
C.
embrace a new era of peace and prosperity
D.
remember to atone and preach
【判断题】置信区间的置信度为 ,可理解为点估计的值有 概率落在置信区间之中。