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问题 单项选择题

在民航空管SMS审核检查表关于安全政策的内容及贯彻落实中，审核各级员工是否了解单位的安全政策时，审核方式为（）

A.现场检查

B.查阅文档

C.访谈

D.其它选项都不对

答案

参考答案：C

判断题

《监理工程师通知》可以由总监理工程师发出，也可以由专业监理工程师发出。
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单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (41) 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 (42) , 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 (43) network layer, the router may be able to translate between the packet 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 (44) . As an example, gateways between Internet E-mail and X.400 E-mail must (45) the E-mail message and change various header fields.

A．frames

B．packets

C．packages

D．cells
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