Founding a data - base of the products is an effective way of retrenching energy and decreasing pollution in the process of reuse of the old parts.
建立产品零件用材数据库，以便在生命周期终结后的机械零件循环利用时，有效地节约能源和减少污染。
If deploying sensor nodes in general way, i. e. deploying nodes uniformly in the network, sensor nodes nearby the base station will use up energy soon and the base station can't collect data anymore.
如果采用通常的方法，即均匀布置传感器节点，则基站附近的节点将很快消耗完能量，基站也就无法收集数据。
The parameter data-base of the beam pumping unit and the newly energy-saving pumping unit is established, which lay a solid foundation for the simulation of the rod pumping system.
建立了游梁抽油机和新型节能抽油机的参数数据库，为实现对有杆抽油泵系统的仿真研究奠定了基础。
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