题目内容：
4.PLC扫描周期是一次循环所需的（ ）。其长短与PC机性能、用户程序的长短有关。通常为（ ）ms
参考答案：
选择题：4.PLC扫描周期是一次循环所需的（ ）。其长短与PC机性能、用户程序的长短有关。通常为（
- 题目分类：青岛理工大学电气控制PLC(本)复习题
- 题目类型：选择题
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模块
模块
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