When the outer ring of the bearing and the outer end surface of the end cap are formed into a cone, the cone tops of the two conical faces must be coincident. When the outer ring of the bearing and the outer end surface of the end cap are made into a hyperbolic conical surface, the structure is
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Read moreA large number of migrant workers suffering from occupational diseases cannot be ignored. According to statistics, there are more than 16 million toxic and hazardous enterprises in China, and the total number of migrant workers exposed to occupational disease hazards exceeds 200 million, making the
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