Internal feedback cascade speed control system is proved to have a good cost performance and can be used on large and medium type fans extensively.

内反馈串级调速系统是一种具有优良的性能价格比的调速节能设备，适合于电厂的大中型风机调速节能运行。

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Trough the investigation on the performances of some kinds of additives, the formula composition of DCB4012CF Marine diesel engine oil with medium speed and cylindrical piston type was validated.

通过对各类添加剂性能的考察，确定了DCB4012 CF船用中速筒状活塞柴油机油的配方组成。

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In this paper, the design basis, calculation method and construction feature of the new type composite oil ring with helical spring used in the medium and high speed diesel engine are described.

本文介绍了一种中、高速柴油机上使用的螺旋弹簧式组合油环的设计依据、计算方法及结构特点，总结了在120型柴油机上的试验结果。

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