The maximum level of muffling being taken as object function, the parameters of muffler's whole structures have been optimized by using the method of dynamic transfer matrix analysis.
本文用消声器动态传递矩阵分析方法，以最大消声量为目标函数，对消声器的总体结构参数进行了优化。
The scope, focus, and rigorous level of accreditation are different due to the various object, function, and participation mode of accreditation program.
由于认证对象、认证功能、自愿或强制性的不同，班级经营认证会有不同的范围、焦点、严格度。
The scope, focus, and rigorous level of accreditation are different due to the various object, function, and participation mode of accreditation program.
由于认证对象、认证功能、自愿或强制性的不同，班级经营认证会有不同的范围、焦点、严格度。
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