fpf

Its K 0 groups , connections with PF rings and FPF rings , closed properties under direct sums and other properties are studied .

研究了它的K0群及它与PF环、FPF环之间的关系，并研究了其对于直和的封闭性等其它性质。

But there are some at the FPF who have not forgiven Queiroz after he left under a cloud in1993 following Portugal 's failure to qualify for the '94 World Cup .

但是有些事葡萄牙足协至今没有原谅奎罗斯，他在1993年带队冲击94美国世界杯失败后下课。

So far , FPF has been studied a lot at home and abroad . FPFs with different modulation principles have their own advantages and disadvantages in the modulation range , response speed and insertion loss , so the filters have been used in different situation .

到目前为止，国内外对FPF的研究已经很多，利用不同调制原理的FPF在调制范围、响应速度、插入损耗等方面各有优缺点，得到了不同的应用。