Each group consists of 2-6 cover hairs, the cover hairs have follicles of their own and each of the cover hairs has sebaceous gland and sweat gland.
毛囊群由2—6根粗毛组成，粗毛有独自的毛囊，每一毛囊有皮脂腺和汗腺。
A valve body is connected with a tower cover through soft seal, and pressed by a bracket through a bolt. The valve rod, the tower cover and a gland are pressed and sealed by filler.
阀杆、塔型盖、格兰通过填料压紧密封，阀杆与执行机构通过固定于支架上的推力螺母实现上下运动。
A valve body is connected with a tower cover through soft seal, and pressed by a bracket through a bolt. The valve rod, the tower cover and a gland are pressed and sealed by filler.
阀杆、塔型盖、格兰通过填料压紧密封，阀杆与执行机构通过固定于支架上的推力螺母实现上下运动。
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