题目内容

At 0230 on 13 August，you are at mile 610.5 AHP when you see about a mile ahead lights on the water near the left bank. What might you see when you come abreast of these lights? （）

A. Privately maintained buoys at a yacht club
B. Government buoys marking the Hurricane Point dikes
C. Barges moored at the Dennis Landing Terminal
D. A pipeline discharging dredge spoil

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A. 观测前应看清竖盘注记形式，定垂直角计算公式
B. 对中、整平经纬仪，量取仪器高并记录
C. 盘左位置瞄准目标，对准标尺确定目标高处，务必使竖盘水准管气泡居中后读数
D. 盘右观测方法同C
E. 读个测回观测垂直角时，各测回间变换垂直度盘起始位置再观测

A. 正确
B. 错误