The fetus needs to have sufficient strength and elasticity to withstand the shock and impact of the tire, and bear the radial, lateral, and circumferential deformation caused by the tyre in the driving. The fetal body is composed of a layer or a layer of rubber curtain, which can make the fetus and the whole tyre have the necessary strength
To restore the original driving block method;
Rail transit has long been used as public transport in cities. It plays an increasingly important role. Economic developed countries urban traffic development history tells us that only by large passenger traffic system of urban rail transit (metro and light rail), is an effective way to fundamentally improve the urban public traffic
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