本文就分组交换机的启动过程进行了探讨，并就两种软件加载方式进行了详细的分析。

This paper discusses the starting procedure of packet switching and two methods of software loading are described in detail.

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第三代移动通信系统WCDMA的发送分集方式有两种：开环模式和闭环模式，其中开环模式采用基于空间-时间分组编码的STTD发送分集方式。

There are two modes of transmit diversity for the third generation mobile communication system WCDMA: open-loop mode and the close-loop mode.

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