In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

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.

1（）

A．sequence

B．stream

C．Queues

D．flow

根据《环境影响评价技木导则地面水环境》，下述情况水质预測适用二维解析模式的是（）。

A.水深变化不大的水库中连续恒定排放点源

B.水深变化较大的水库中连续恒定排放点源

C.水深变化不大的水库中连续恒定排放面源

D.水深变化较大的水库中连续恒定排放面源