【单选题】
7在DIP40封装的8×51芯片里，接地引脚与电源引脚的引脚编号是什么？___
A. 1、21
B. 11.31
C. 20、40
D. 19、39
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答案
C
解析
暂无解析
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24在8×51的程序里，若要将某个输入/输出端口设置成输入功能，应如何处理？___
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29在Keil µVision3里进行调试/仿真时，在哪里操作才能触动程序中断？___
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【单选题】
36在12MHz的8×51系统里，哪一种方式一次可定时5ms？___
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Which two features are commonly used CoPP and CPPr to protect the control plane？ ___
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【多选题】
Which three ESP fields can be encrypted during transmission？___
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Which statement about the communication between interfaces on the same security level is true？___
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【单选题】
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