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在制定销售价格时，总要具体计算成本价格，请问如何计算呢？

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简答创办你的企业第一至第十步的主要内容。

What is the name of a network-layer packet?

A. message
B. segment
C. datagram
D. frame

What are the two most important network-layer functions in a datagram network?

A. forwarding & routing
B. forwarding & filtering
C. routing & detecting
D. routing & checking

When a packet arrives at a router’s input link, the router must move the packet to the appropriate output link, this action is called ____?

A. Forwarding
B. routing
C. cut through
D. filtering