题目内容
Years ago the professor said that there was no doubt that the people in this city would be with a water shortage, if not a water crisis.
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The new system is said to enable us to use much less oil than before, in other words, to increase energy considerably.
已知经纬仪竖盘的刻划注记形式为顺时针，盘左望远镜水平时竖盘读数为90°。经盘左、盘右测得某目标的竖盘读数分别为：L=76°34′00″，R=283°24′00″，则一测回竖直角为（）。
利用视距测量测定碎部点的平距和高程时，下面哪组数据可以求出碎部点的平距和高程（望远镜中丝瞄准觇标高、测站高程已知）：（ ）。
当经纬仪竖轴与目标点在同一竖面时，不同高度的水平度盘读数（ ）。
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