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单词 double centering
释义

WordReference Random House Unabridged Dictionary of American English © 2024
double centering, [Survey.]
  1. Surveyinga method of extending a survey line by taking the average of two foresights, one with the telescope direct and one with it inverted, made each time by transiting the telescope after a backsight.

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更新时间:2024/9/22 19:44:39