Now, a relatively complete manufacturing system of electronics has been established to provide large amounts of electronic installations and a cross-section of electronic products.
建立了比较完整的电子工业生产体系，提供了大量电子装备和各类电子产品。
Complete classification of affine spheres with constant cross section curvature in 4-dimensional affine space is given.
本文给出了四维仿射空间中具有常截面曲率的仿射球的完全分类。
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