It is used with single line and double line system by piping line.

它是用单线及双线系统管道路线。

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This paper discussed the rule for improving safety of mine winder with double-line system, and gave the way to accomplish it based on PLC technique fitting for the real safety status.

论述了提高矿井提升安全的智能双线制安全控制原则，针对目前煤矿提升安全现状，提出了用P LC实现提升机智能双线控制技术的方法。

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This paper studies the characteristic parameters of the engine mounting system and puts forward a method of employing the double-line cushion material for the engine mounting system.

对悬置系统特征参数进行研究，并提出采用双直线型缓冲材料作为汽车发动机悬置系统的方法。

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