Approximate comparative table 各国相似规范对照表
NUMROWS is used to provide an approximate number of rows that an external table can have.
NUMROWS用于提供一个外部表可能拥有的大致行数。
NUMROWS: the approximate number of rows that the external table can possibly have.
NUMROWS：外部表可能拥有的大致行数。
According to possessing the characteristics of approximate description of function expression, the control system structure employing mapping table to implement controlling is presented sequentially.
根据映射表具有的函数近似描述特性，提出了采用映射表实现控制器的系统结构。
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