Then , it raises the following questions , in our present market environment and legal framework , what characteristics do 50etf transaction mechanisms have ? what is the meaning of the arbitrage to etf ? and as one of the most important functions of arbitrage trading , how to play its due role , and how to further improve and develop the etf products and related derivatives 那么,由此引出的问题就是:在我国现有的市场环境和法律框架内,上证50etf的交易运行机制有哪些自身的特点,套利对于etf的意义何在,作为etf最重要的功能之一的套利交易能否发挥它应有的作用,如何才能进一步完善和发展etf产品及其相关衍生品等等。
North bridge is the center of communication with many high - speed buses and connects cpu , sdram , apg equipment and pci equipment . south bridge is connected to north bridge with pci bus , it has many low speed buses , such as isa , ide , usb , floppy disk , p / s2 , serial port , parallel port . with its characteristic , this system has two million ethernet interfaces and one watch - control module 其中，北桥是整个系统的核心通信部分，含有丰富的高速总线接口，连接了cpu 、 sdram 、 agp设备和pci设备；南桥和北桥通过pci总线互联，它引出的总线一般速率比较慢，如isa 、 ide 、 usb 、 floppydisk 、 p s2 、串口、并口等。
