There are three types of seasonal influenza – A, B and C. Type A influenza viruses are further typed into subtypes according to different kinds and combinations of virus surface proteins.
有三种类型的季节性流感——甲型、乙型和丙型。 根据病毒表面蛋白不同的种类和结合情况，甲型流感病毒又进一步分类为亚型。
An optimized design in the C-frame Hydraulic Press has been introduced, the most reasonable suggestion has been adopted after a contrast among three kinds of bodies via the finite element calculation.
介绍了单柱液压机的优化设计，通过对三种机身有限元计算结果的比较，选用了最合理的优化设计方案。
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