某日历上一竖列的相邻三个数的和为63,则中间一个的日期是( )。
21
An internet is a combination of networks connected by () .When a datagram goes from a source to a () ,it will probably pass many () until it reaches the router attached to the destination network.A router receives a () from a network and passes it to another network.A router is usually attached to several networks.When it receives a packet,to which network should it pass the packet The decision is based on optimization: Which of the available () is the optimum pathway.
A router receives a () from a network and passes it to another network.
A.destination
B.resource
C.packet
D.source
拆卸或搬运气囊组件时,气囊装饰盖的面应当朝下。()