The first chapter particularly discusses the characteristic of LPG cargo and analyses its sources, which gives a concrete conception for the Marine enterprises.
第一章对L PG货物的特性及货源进行了全面分析，使水运企业对运输对象有具体的了解和掌握。
The characteristic of PLC is introduced and the application of PLC with mightiness logic and number function in hoist control system underground small cargo hoist is emphasized.
介绍了可编程序控制器（PLC）的功能和特点，着重阐述了具有强大逻辑、算术控制功能的PLC在小型货物提升机控制系统中的应用。
Container lines, set up to be engaged in the regular carriage of containerized cargo by sea, are special enterprises with sharp service characteristic.
集装箱班轮运输企业是以提供海上集装箱定期运输服务，并带有浓厚服务性色彩的企业组织。
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