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问题 填空题

已知小明在小红东偏北30度的方向上，那么小红在小明______偏______度的方向上．

答案

以小红为中心，小明在小红东偏北30度，

以小明为中心时，小红就在小明的西偏南30度的方向上．

故填：西，南30．

选择题

— Well, that was really a good meal. I _____ you were a really good cook.

— Thank you.

A．didn’t know

B．don’t know

C．haven’t known

D．hadn’t known
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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 (71) 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 (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe 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 (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

A．special

B．dependent

C．similar

D．dissimilar
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