Core TradesCâu 51 / 700
In differential leveling, a 'backsight' reading is taken on:
a.A point whose elevation is being newly determined
b.The next station ahead in the direction of travel
c.A point of known elevation, such as a benchmark, to set the instrument height
d.The lowest point in the excavation
Giải thích
A backsight is read on a point of known elevation (a benchmark or turning point) to establish the height of the instrument. A foresight, by contrast, is read on the new point whose elevation is being found.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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