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摩托车内胎的气门嘴上都有一个胶制的防尘帽,起着防止灰尘、泥水溅人气门芯的作用。笔者对防尘帽作了改进,使之不仅能防尘,而且能增加气
Motorcycle inner tube valves have a plastic dust cap, plays a role in preventing dust, splashing popular door. The author made improvements to the dust cap to make it not only dustproof, but also to increase the gas