Discusses the selection line methods of convey coal pipe of long distance, from the angles of selection line principle, and the basic data to collect, etc.
本文从选线的原则、选线需搜集的基础资料等角度，论述了长距离输煤管道线路的选线方法。
The paper introduces the characteristics and methods in the drying of plastics and the principle, structure and selection of the dryer.
介绍塑料干燥的特点、方法和干燥设备的原理、结构及选用。
Firstly, starting from the cost driver selection, the paper analyzes its selection principle and influencing factor, then summarizes and compares all kinds of methods of cost driver selection.
首先，本文从成本动因的选择入手，分析了成本动因选择的原则、影响因素和各种方法，并概括和比较各种方法。
The working principle, characteristics and electric parameter selection of the restraint EMI circuit are studied in this paper. The computing methods of electric component parameters are given.
对所设计的抑制电磁干扰电路的工作原理、特点和电气参数选择等进行了研究，给出了相应电气元件参数选择的计算方法。
The working principle, characteristics and electric parameter selection of the restraint EMI circuit are studied in this paper. The computing methods of electric component parameters are given.
对所设计的抑制电磁干扰电路的工作原理、特点和电气参数选择等进行了研究，给出了相应电气元件参数选择的计算方法。
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