(66) is a channel’ s capacity which directly reflects the data transfer rate of the channel. (67) functions in a NetWare network which is used to define addressing schemes. (68) is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains. (69) ．is the popular LAN develped under the direction of the IEEE 802.3. (70) is a device which enables digital microcomputers to communicate across analog telephone lines.

A. The repeaterB. The hub
C. The bridge D. The router

项目安全保证计划应在项目开工前编制，经( )批准后实施。

A．项目经理

B．安全工程师

C．安全员

D．监理工程师