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问题 单项选择题

客房管理人员检查电视机，主要查看电视机是否干净无尘、使用正常且（）。

A、检查电视的信号是否清楚

B、调至规定的频道和音量

C、调试电视机的不同频道

D、测试电视机的图像清晰度

答案

参考答案：B

多项选择题

起重操作“十不吊”的规定，下列表述正确的有：（）。

A、工件捆绑、吊挂不牢不吊

B、司索工未戴好安全帽不吊

C、吊索具达到报废标准或安全装置失灵不吊

D、重物棱角处与吊绳间未加垫衬不吊
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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 (64) or Hubs, which just move the bits from one network to an identical net-work. One layer up we find bridgas and swiehes, which operate at data link layer. They can accept (65) , 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 netwoks. If two networks have (66) 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 the two transport connections. Finally, in the application layer, application gateways translate message

(67) . As an example, gateways between Internet e-mail and X.400 e-mail must (68) the e-mail message and change various header fields.

66（）

A．special

B．dependent

C．similar

D．dissimilar
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