文件名称:vaa
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（１）设计一个4位十进制的频率计其测量范围1Hz~9.999KHz；6 N3 G8 k( U- @ n* A
（２）记数过程结束后，保存并显示结果；-(1) to design a metric four of its frequency range 1Hz ~ 9.999KHz 6 N3 G8 k (U-@ ' n* A (2) After the counting process, preserve and display the results
（２）记数过程结束后，保存并显示结果；-(1) to design a metric four of its frequency range 1Hz ~ 9.999KHz 6 N3 G8 k (U-@ ' n* A (2) After the counting process, preserve and display the results
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