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选择多个不相邻的文件或文件夹:选择第一个文件或文件夹后,按住 键,然后单击最后一个文件或文件夹即可。
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【简答题】用555定时器组成单稳态触发器的电路如下图所示，试分析电路的工作原理，画出工作波形并计算电路的周期和频率。
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