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问题 单项选择题

一侧髁突颈部骨折后髁突断端最容易发生移位的方向是（）

A.向外

B.向内

C.向后内

D.向后外

E.向前内

答案

参考答案：E

选择题

下列物质在空气或氧气中燃烧，能生成黑色固体的是

A．红磷

B．木炭

C．铁丝

D．石蜡
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单项选择题

Frame Relay is simplified form of (71) , similar in principle to (72) , in which synchronous, frames of data are routed to different destinations depending on header information . Packets are routed throught one or more Virtual Circuits known as (73) . Most Virtual Circuits are (74) ,which means that the network provider sets up all DLCI connections at subscription time. (75) are also part of the Frame Relay specification . They privide a link that only lasts only as long as the session.

A．Permanent Circuits

B．Permanent Virtual Circuits

C．Switched Virtual Circuits

D．Switched Circuits
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