解决方案是提供用于生成可在所有测试工程中复用的测试输入的一般框架。

The solution is to provide a generic framework for generating test inputs that can be reused across all testing projects.

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选择器在内部调用一个本机 poll() 函数（见 清单 5），这个函数支持在一组文件描述符上多路复用输入和输出

The selector internally calls a native poll() function (shown in Listing 5), which provides a mechanism for multiplexing inputs and outputs over a set of file descriptors

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LC大部分输入采用分时复用技术，输出采用矩阵输出的方法，大大减少了I/O点数。

Most of inputs of PLC use time-sharing multiplexing technology and outputs use matrix outputs, which greatly reduce I/O points.

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