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问题 单项选择题

过敏性紫瘫的并发症中，需要外科处理的临床情况有

A．自发性张力性气胸

B．泌 * * 阻塞

C．关节腔积血

D．肠套叠

E．皮肤大面积坏死

答案

参考答案：D

解析：部分患儿可有黑便或血便，偶见并发肠套叠、肠梗阻或肠穿孔者。

问答题 简答题

试述危机干预的早期对象
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单项选择题

(51) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(52) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(53) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(54) is the popular LAN developed under the direction of the IEEE802.5.

(55) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

（53）是（）

A. The hub

B. The bridge

C. The router

D. The proxy
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