【单选题】用经纬仪对某角观测9次,其观测结果的算术平均值中误差为±2”,则该角的观测值中误差为()。
【简答题】根据以下资料。回答 106~110 题。{Page} {Page} 第 106 题 1996年,的货物进出口额为( )。
【单选题】用经纬仪对某角观测9次,其观测结果的算术平均值中误差为±2′′,则该角的观测中误差为( )。
【单选题】用经纬仪对某角观测9次,其观测结果的算术平均值中误差为±2",则该角的观测值中误差为()
【判断题】电流互感器工作时,一次绕组与被测电路并联。
【简答题】道岔尖轨按尖轨跟端构造形式可分为()和间隔铁式()两种。
【简答题】Many parents want their children to be famous one day. But do children have the same ? A new — Hi, Ke’ai is on at Beijing Children’s Art Theater. It tells the story of a boy called Ke’ai. His parents ...