【简答题】整理表中的测回法水平角观测记录。用DJ6光学经纬仪观测,要求半测回差及各测回互差均小于±40"。 测站 盘位 目标 水平度盘读数 水平角 各测回平均角值 半测回角值 一测回角值 O 第一 测回 左 A 0°01'00' B 88°20'48' 右 A 180°01'30' B 268°21'12' O 第二 测回 左 A 90°00'06' B 178°19'36' 右 A 270°00'36' ...
【简答题】阅读理解 Let us suppose it is now about A. D. 2060. Let us believe it is about sixty years from now. Of course, things have changed and life is very different. Voyages to the moon are being made every d...