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N the geometry and trigonometry of figures on the surface of a sphere 球面几何学; 球面三角学
N
N atmospherics的缩写 → short for atmospherics
spherical geometry , spherical trigonometry
The mathematical models of the dynamic target and the tested apparatus are constructed with spherical trigonometry spherics.
运用球面三角学，建立了动态靶标与被测仪器间的数学模型；
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