常常要求布置具有多点进料的输送机，它必须用人工来调节。
It is often necessary to arrange a conveyor with multiple points of feed, which must be manually adjusted.
对聚乙烯燃气管道水力学特性、连接方式以及输送人工煤气的可行性进行了分析，阐明了推广应用聚乙烯燃气管的前景。
The paper gives an analysis of the hydraulics properties, the method of connection and the feasibility of transporting artificial coal gas and the prospects of expansion application of PE gas line.
传统的人工运行模式已不能适应新的港口发展趋势，因此在港口物料输送系统中引入现场总线技术，来实现无人值守的自动化运行模式显得尤为重要。
The traditional manual operation mode can not adapt to the new harbor development trend and has to be combined with the field bus technology in order to realize the automatic operation mode.
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