To a router, a flow is a (1) of packets that share the same Characterstics, such as traveling the same (2) ,using the same (3) ,having the same kind of security, and so on. A router that supports the handling of flow labels has a (4) table. The table has an entry for each active flow label; each entry defines the (5) required by the corresponding flow label.

2（）

A．path

B．rout

C．circuit

D．way

手的正侧位摄片，适用于

A．观察掌指骨的骨折
B．高密度的异物定位
C．骨密度的测定
D．关节病变
E．骨龄的确定