“backsight”的概念、定义、翻译、参考文献-科学参考

单词	backsight
释义	backsight [`bak´sīt] ^ENGINEERING 1. A sight on a previously established survey point or line. 2. Reading a leveling rod in its unchanged position after moving the leveling instrument to a different location. ^NAVIGATION A marine sextant observation of a celestial body made by facing 180° from the azimuth of the body and using the visible horizon in the direction in which the observer is facing.
随便看	gap-framepress gap-graded aggregate gap junction gap lathe gapless tape gap markers gapped tape gap scanning gap scatter gar garbage garbage collection garbage in, garbage out garbage pitch garbet rod garbin garble garboard strake garbot rod garbutt rod gardening Gardner crusher Gardner's syndrome gargoylism garigue

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