Traditional network layer packet forwarding relies on the information provided by network layer  (1) protocols, or static routing, to make an independent (2) decision at each hop within the network. The forwarding  (3) is based solely on the destination  (4) IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost  (5) toward a destination, the packets toward the destination might take one or both of them, resulting in

空白（3）处应选择（）

A.connection

B.window

C.decision

D.destination

中国将力学和地质学和固体地球物理学相结合的先驱者是（）。

A、马宗晋

B、李四光

C、王仁

D、李捷