| 单词 | standard refraction |
| 释义 | standard refraction [`stan·dǝrd ri`frak·shǝn] ELECTROMAGNETISM Refraction which would occur in an idealized atmosphere in which the index of refraction decreases uniformly with height at a rate of 39 × 10-6 per kilometer; standard refraction may be included in ground wave calculations by use of an effective earth radius of 8.5 × 106 meters, or 4/3 the geometrical radius of the earth. |
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