For each blank, choose the best answer from the four choices and write down on the answer sheet.
(71) is a channel’ s capacity which directly reflects the data transfer rate of the channel.
(72) functions in a NetWare network which is used to define addressing schemes.
(73) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.
(74) is the popular LAN developed under the direction of the IEEE802.3.
(75) is a device which enables digital microcomputers to communicate across analog telephone lines.

A．The volume

B．The bandwidth

C．The noise

D．The delay

个人提供的下列服务免征增值税的有（）。

A、个人转让著作权

B、个人销售自建自用住房

C、残疾人员本人为社会提供的服务

D、其他个人采取预收款形式出租不动产，取得的预收租金收入，在预收款对应的租赁期内平均分摊后的月租金收入不超过3万元的