“aiming circle”的概念、定义、翻译、参考文献-科学参考

单词	aiming circle
释义	aiming circle [`ām·iŋ ´sǝr·kǝl] ^ENGINEERING An instrument for measuring angles in azimuth and elevation in connection with artillery firing and general topographic work; equipped with fine and coarse azimuth micrometers and a magnetic needle.
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