At the same time, the turn-around ring of the hammer head is made of special composite material, with the qualities of wear-resisting, self - lubricating, non-maintaining, easy changing etc.

同时锤头回转圈采用特殊复合材料，具有耐磨、自润滑、免维护、易更换等特点。

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After contrasting to routine lubricating oils it is concluded that the non-spreading lubricating oil can prolong the operating live of aircraft instrument and that have broad prospects of application.

使用不流散仪表油是延长航空仪表使用寿命的一种可行途径，具有良好的应用前景。

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The gear pump is suitable in the transportation does not contain the solid particle, non-corrosiveness, the viscosity scope big lubricating ability liquid.

齿轮泵适用于输送不含固体颗粒、无腐蚀性、粘度范围较大的润滑性液体。

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