关于bcd码加法器 第一个是一位的 通过了 第二个是四位的没通过?赜赽cd码加法器 第一个是一位的 通过了 第二个是四位的没通过-on bcd yards Adder is a section through one of the second of four is not the adoption of codes increases bcd instruments used in a section of the passage of a second four is not the adoption of bcd yards Adder No. 1 is the adoption of a the second of four is not adopted