钢制储罐的环缝埋弧自动焊主要用于（）施工的罐壁环缝焊接。

A、正装法

B、倒装法

C、气顶法

D、水浮法

关于生成树协议的链路故障检测，以下说法错误的是（）。

A、 网络拓扑结构稳定后，指定端口会每隔 Hello Time 时间发送一个 BPDU 报文

B、 网络拓扑结构稳定后，网络中会不断传递 BPDU 报文

C、 当端口在一定时间内没有收到新的配置 BPDU，则其先前收到的配置 BPDU 就会超时，从而可以检测到链路发生故障

D、 发送端口每隔 Hello Time 发送一个配置 BPDU，如果链路发生故障时，该配置消息就会发送不出去，从而发送端口能够检测到链路故障

接染

Your company uses DHCP to lease IPv4 addresses to computers at the main office.A WAN link connects the main office to a branch office. All computers in the branch office are configured with static IP addresses. The branch office does not use DHCP and uses a different subnet. You need to ensure that the portable computers can connect to network resources at the main office and the branch office.How should you configure each portable computer？（）

A、Use as tatic IPv4 address in the range used at the branch office.

B、Use an alternate configuration that contains a staticI Paddress in the range used at the main office.

C、Use the address that was assigned by the DHCP server as astatic IP address.

D、Use an alternate configuration that contains a staticI Paddress in the range used at the branch office.

目前我国广告公司的主要类型有（）

A、大型的、综合性的

B、合资的

C、中小型的    

D、广告作业机构

最保守的观点认为，在（）个国家或地区以上拥有从事生产和经营的分支机构才算是跨国公司。

A、2个

B、3个

C、4个

D、6个