本文给出了关于二阶曲面的代数定义和射影定义之间的等价性定理。
This article is told the sense of equivalence between algebraic definition and projecting definition.
数字参考咨询已成为第二代数字图书馆不可缺少的一部分。
Digital reference service (DRS) has become the integral part of the second generation digital library.
第一代模拟和第二代数字系统支持语音通信和有限的数据通信能力。
The 1st and 2nd generation wireless telecommunication system provide voice traffic and limited data traffic.
第一代模拟和第二代数字系统支持语音通信和有限的数据通信能力。
The 1st and 2nd generation wireless telecommunication system provide voice traffic and limited data traffic.
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