题目内容

谷物冷却机在运行之前,应该检查风阀的()(若风机为无级变速可省略此项)。

A. 位置
B. 箭头
C. 电流
D. 方向

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某石方路堑开挖的大量石方需调运到1000m外的路堤处,宜选择的运输机械是()。

A. 自行式铲运机
B. 拖式铲运机
C. 自卸汽车
D. 推土机

网络协议由语法、()和语序三大要素构成。

You have just installed a new web server on the Testking network. You are required to ensure that the web server is accessible from the Internet. The network uses private addressing, so an IP-to-registered address mapping is required.To do this, you enter the following command:TestKing(config)# ip nat inside source static 192.168.2.1 198.18.1.254 You unsuccessfully try to ping the Internet from a PC host on the LAN. During the troubleshooting process, you enter the "show ip nat translations" command but the output is blank. What is the most likely cause of the problem?()

A. The keyword overload is missing from the command.
B. The NAT pool must be defined first.
C. An access list must be defined to create static NAT translations.
D. The interfaces must be configured for NA
E. None of the above

简述使用Linux的socket建立UDP服务端程序的步骤及相关函数。

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