“gunner's quadrant”的概念、定义、翻译、参考文献-科学参考

单词	gunner's quadrant
释义	gunner's quadrant [¦gǝn·ǝrz `kwäd·rǝnt] ^ENGINEERING Mechanical device having scales graduated in mils, with fine micrometer adjustments and leveling or cross-leveling vials; it is a separate, unattached instrument for hand placement on a reference surface.
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