2-9进制的数字转换 中缀表达式转换为后缀表达式 字符串中字母的频率及排序 括号配对的验证 链表式储存及功能-2-9 band of the digital conversion infix expression into postfix expression string and sort the letters in parentheses matching the frequency of verification of storage and features list

数字频率计，能直接计数单位时间内被测信号的脉冲数，然后以数字形式显示频率值-Digital frequency meter, count the measured signal number of pulses per unit time, frequency value is then displayed in digital form

频带数字通信中,频带一阶锁相环simulink模型 不错的 很好-Band digital communications, frequency band of first order phase-locked loop simulink model good is very good