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问题 单项选择题

贲门周围血管离断术中不应离断的血管是( )

A．冠状静脉

B．胃短静脉

C．胃后静脉

D．左膈下静脉

E．胃右静脉

答案

参考答案：E

解析： 贲门周围血管可分为4组：冠状静脉、胃短静脉、胃后静脉、左膈下静脉。手术时该4组静脉均应切断。

单项选择题

顺丰快递华北分拨中心位于北京空港物流园，负责京津冀地区的物流分拣、配送。此外，该公司还建立了广东深圳、江苏南通、山东潍坊、河南郑州等多个区域分拨中心。影响这些分拨中心建设的主导区位是（）

A.科技、市场

B.交通、市场

C.地价、劳动力

D.交通、劳动力
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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.

(21) 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.

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

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

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

(25) 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.

（25）是（）

A.X.25

B.ATM

C.FDDI

D.SMDS
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