着重介绍了设计中主要参数的确定，容器类别的划分，主要受压元件的计算和结构设计。
The design basis includes the main parameters, the type of vessel, the design of structure and the calculation of the main pressure elements.
该层次结构在概念上可以划分为四种类别：简单类型、容器类型、代码类型和内部类型。
This hierarchy can be conceptually broken down into four categories: simple types, container types, code types, and internal types.
电容器安全使用条件不仅受额定电压（或类别电压）的限制，而且受额定电流的限制。
Safety use of capacitor must be within the rated voltage(or category voltage)and the permissible current.
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