74LS系列芯片的比较全的简介,74系列虽然已不是主流,但在一些硬件电路中还是时常见到,其低价格高性能的特点，仍然是电子电路应用中不可缺少的一员.-74LS series chips Compare the profiles, although the 74 Series is not the mainstream, but in some hardware circuit or often see that its high-performance low-cost feature is th

如果您正在寻找一种免费或不昂贵的BBS系统，可以有几个选择，如LB5000，或者汉化的 VB,UBB 等。在将 SRPBoard 与其他 BBS 系统进行比较时，所要考虑的重要因素是性能，速度，功能，易用性，支持和特性，许可条件和价格。-If you are looking for a free or inexpensive BBS system, there are several options, such as LB5000, or localization of VB, UBB and