可引起人发生肠梗阻的寄生线虫是（）。

A、蛔虫 

B、旋毛虫 

C、钩虫 

D、蛲虫

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