【简答题】One day,a poor boy,who was selling newspapers from door to door in order to pay for his schooling,found he had only ten cents left,and he was 1 .He decided to ask for a meal at the next house.However,...
【多选题】时差分解剩余静校正中,为使模拟的剩余时差t i,j ’与实际拾取的时差t i,j 的表达式 达到最小,可以形成了一个由n s +n r +n e +n h 个方程组成的线性方程组。其中,n s ,n r ,n e 和 n h 分别为 , ,中心点个数和覆盖次数。
【单选题】时差分解剩余静校正中,为使模拟的剩余时差t i,j ’与实际拾取的时差t i,j 的表达式 达到最小,求ε关于 s i ,r j ,G k ,M k 的偏导数 ,形成了一个由n s +n r +n e +n h 个方程组成的线性方程组。
【单选题】时差分解剩余静校正中,剩余时差 t i,j 中求出后,通常得到一个未知量和方程个数不等的超定方程组,可以通过 来实现剩余时差对炮点和检波点的分解。
【单选题】如果上游工厂污染了下游居民的饮用水,按照科断定理
【简答题】完成句子(共10小题;每小题1.5分,满分15分) 小题1:The relatives of the victims in the earthquake asked for£43 million from the seven experts (被指控) failing to give enough warning about the disaster. (accuse) 小题2:It was...
【简答题】When you run, you put force that is equal to three times your body weight on your feet. The human foot contains twenty muscles(肌肉). This means that there is a lot that can go wrong when you run. Most ...