下列关于企业的资产结构与资本结构关系的叙述，正确的有( )。

A．拥有大量的固定资产的企业，主要通过长期负债和发行股票筹集资金

B．拥有较多流动资产的企业，更多依赖流动负债筹集资金

C．资产适用于抵押贷款的公司举债额较多

D．以研究开发为主的公司负债较多

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．channel

B．computation

C．speed

D．bandwidth