与受累牙牙根融合的是（） A．成釉细胞癌 B．牙源性钙化囊性瘤 C．牙源性角化囊性瘤

    Ann is a girl,       she can climb that tall tree.

A．But , /

B．Although, /

C．But, although

D．Although, but

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 suppors 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.

5（）

A．quality

B．traffic

C．services

D．route

“书山有路勤为径，学海无涯苦作舟”说明学习中到处是苦，没有快乐。[ ]

用手持式转速表测速时，对于不知旋转件转速时，应先将调速盘调到低档，逐次往高档测试。

独立避雷针接地阻抗不宜大于（）。

A.1

B.5

C.10

D.15