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问题 单项选择题

患者，男，50岁。夜间右足背蛇咬伤8小时，蛇种类不清，局部疼痛不剧烈，逐渐出现头昏、胸闷、恶心、四肢乏力、眼睑下垂、语言不利等。最可能所咬的蛇毒种类为（）。

A.火毒

B.风毒

C.风火毒

D.热毒

E.湿毒

答案

参考答案：B

单项选择题

硝酸酯类药物舒张血管的作用机制是（）

A.选择性阻断α1受体

B.直接激动β2受体

C.促进钾通道开放

D.释放一氧化氮

E.阻滞Ca2+通道
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单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(71) is a channel’ s capacity which directly reflects the data transfer rate of the channel.
(72) functions in a NetWare network which is used to define addressing schemes.
(73) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.
(74) is the popular LAN developed under the direction of the IEEE802.3.
(75) is a device which enables digital microcomputers to communicate across analog telephone lines.

A．The repeater

B．The modem

C．The hub

D．The printer
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