接力站
- relay stations
接力站-
通过用户站的多级接力，中心站可以和每一个用户站进行通信。系统硬件简单，占用频率资源少，成本低。
With the help of some users'multi-level relay , the center station can communicate with each user int he system .
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随着排距的增加，接力输送方式的使用，机械设备的选择与配套、接力站安设位置准确与否对系统的生产效率和生产成本都起着决定性的作用。
As the transport distance increasing , the use of relay transport , the choice and completing of machine equipments and the position of relay station perform a decisive function to efficiency and cost of whole system .