而第二个是c类型。
Same as type c, but added circumferential seal, can be used in heavy dust environment.
与C型相同，但增加圆周密封，可应用于多粉尘环境。
Type C influenza cases occur much less frequently than A and B.
与甲型和乙型流感病例相比，丙型流感病例发生较少。
Type c: Total ear reconstruction with autogenous rib cartilage.
型：自体肋软骨移植行全耳再造术。
Type C is suitable for daily chemical, medicine, electronic and food industries.
C型—日化、医药、电子及食品等行业；
Type C is suitable for daily chemical, medicine, electronic and food industries.
C型—日化、医药、电子及食品等行业；
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