(一)(本大题共2小题，每小题6分。共12分)19世纪末，美国西部有个坏孩子，他把石

若需拔除位于放射治疗区的患牙，最佳拔牙时间是（）

A.放疗前1个月

B.至少放疗前7～10天

C.放疗后即刻

D.放疗后1周

E.放疗后1个月

患者，男，11岁，下颌面部呈相对后退位，口唇闭合呈现口唇肌肉紧张，覆5mm，覆盖9mm，四个第一磨牙Ⅱ类关系，上前牙拥挤明显，ANB为10.0°，SNA为84.5°，X线片显示四个第三磨牙存在，下颌Spee曲线明显。

患者按安氏Ⅱ类Ⅰ分类错的颅面骨骼类型可为（）

A.上颌下颌位置均正常

B.上颌正常，下颌后缩

C.上下颌后缩型

D.上颌后缩，下颌正常

E.上颌前突，下颌正常

Networks can be interconnected by different devices in the physical layer networks can be connected by (1) or hubs. Which just move the bits from one network to an identical network. One layer up we find bridges and switches which operate at data link layer. They can accept (2) examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer, we have routers that can connect two networks, If two networks have (3) network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections Finally, in the application layer, application gateways translate message (4) . As an example, gateways between Internet e-mail and X.400 e-mail must (5) the e-mail message and change various header fields.

A．special

B．dependent

C．similar

D．dissimilar

在一烧瓶中，在25℃时存在着平衡：2NO₂N₂O₄；ΔH＜0。把烧瓶置于100℃的水中，则下列几项性质①颜色；②平均相对分子质量；③质量；④压强；⑤密度。不会改变的是          (      )

A．①和③

B．②和④

C．④和⑤

D．③和⑤

以下称呼中属于“别号”的是？（）

A.五柳先生

B.东邪

C.一灯大师

D.金毛狮王