“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	magmatic segregation magmatic stoping magmatic water magmatism magmosphere magn magnafacies magnesia magnesia brick magnesia cement magnesia magma magnesia mica magnesia mixture magnesian calcite magnesian limestone magnesian marble magnesia refractory magnesiochromite magnesiocopiapite magnesioferrite magnesite magnesite brick magnesite wheel magnesium magnesium acetate

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