“obstacle clearance box”的概念、定义、翻译、参考文献-科学参考

单词	obstacle clearance box
释义	obstacle clearance box [`äb·stǝ·kǝl ¦klir·ǝns ´bäks] ^NAVIGATION A rectangle on an aeronautical chart which encloses a number indicating the obstacle clearance required (in feet) on an approach segment where the box appears.
随便看	Frenkel-Halsey-Hill isotherm equation Frenkel pair frenulum frenum frequency frequency agility frequency allocation frequency analysis frequency analyzer frequency-azimuth intensity frequency band frequency bridge frequency carrier system frequency changer frequency-changer station frequency characteristic frequency coding frequency compensation frequency conversion frequency converter frequency counter frequency curve frequency cutoff frequency-dependent selection frequency deviation

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