交换器的再生工艺有哪几种，实施中各有什么特点？

将函数f（x）=sinx展开为的幂级数。

成本计算法

世界上唯一没有中断的古代文明是（）。

检查组应于检查结束后（）工作日内，向财政部门提交书面财政检查报告，特殊情况下，经财政机关主要负责人批准，提交财政检查报告的时间可以延长，但最长不得超过（）。

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 Kb/s～512 Kb/s in the reverse direction depending on the distance, 12 000 or 18 000 feet.. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．sends

B．personates

C．receives

D．writes