通常优盘通过______接口与计算机相连接。 A．USB B．SCSI C．ID

依据《建设项目环境影响评价资质管理办法》规定，评价机构以欺骗、贿赂等不正当手段取得评价资质的，除由国家环境保护总局取消其评价资质外，评价机构在( )年内不得再次申请评价资质。

A．1

B．2

C．3

D．4

根据《村民委员会组织法》，村民委员会是( )组织。

A．互相管理、互相帮助、互相支持的农村村民基层

B．团结、互助、推动农村发展的农业户籍人口自治的

C．以发展新农村为目标的农村地区设立的基层

D．自我管理、自我教育、自我服务的基层群众性自治

E．自发性、自治性的自我服务

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (11) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (12) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (13) network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

12（）

A.frames

B.packets

C.packages

D.cells

斜井提升用的钢丝绳必须定期检查（）情况。

A、磨损

B、完整

C、断丝

D、圆度