由于JDO仍是一种相当新的技术(最新的J2EE持久性解决方案)，所以我们将首先概述其工作原理。
Since JDO is still a rather new technology (the youngest of J2EE's persistence solutions), we'll start with an overview of how it works.
概述了其工作原理及负载电压变化。
Its working principle and load voltage variation are all presented.
概述了滚动导轨的特点、应用和常用的材料，并介绍了其结构和工作原理及其设计的有关参数的确定。
The characteristic, application and common material of rolling guide are summarized. At the same time the construction, work principle and decision of relative design parameter are introduced.
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