teaching materials in the area
...omotion and supply of Zhiying curriculum and- teaching materials in the area|独家负责该地区直映教育课程及教材的推广供应. Direct access to excellent educational video teaching technical support and teaching resources|获得直映教育优秀的教学技...
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teaching materials in the area
该地区的教学材料
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The calculation on area of the Fyesnel's half wave zone is not accurate in many teaching materials. The mistake is pointed out, and a correct solution is given.
指出了光学教材中，菲涅耳半波带面积计算中的不合理近似及其错误结论，并提出正确的解决方法。
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