Warning: file_put_contents(): Only 0 of 4979 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/5678977.com/index.php on line 55 validity duration of e-cash例句_validity duration of e-cash英汉例句_validity duration of e-cash双解例句_加林查网西语词典
The concept of validity duration of E-cash is introduced in this paper. Hereby, we present an off-line E-cash system with finite circulation period. 提出了电子现金有效期的概念，据此建立了一个有限流通期离线电子现金系统。