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问题 单项选择题 B型题

尿化学及沉渣检查中，“当血浆葡萄糖浓度升高，进入原尿中的葡萄糖超出肾小管重吸收阈值或肾小管重吸收葡萄糖阈值下降时”属于（）

A.草酸钙结晶

B.亮氨酸结晶

C.磷酸钙结晶

D.酮体从尿中排出

E.葡萄糖从尿中排出

答案

参考答案：E

填空题

数据库技术的主要特点为数据的集成性、数据的高 【4】 和低冗余性、数据独立性和数据统一管理与控。
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单项选择题

In the open systems interconnection (OSI) reference model, "layer" means one of seven conceptually complete, (71) arranged groups of services, functions, and protocols, that extend across all open systems.

Application layer provides means for the application (72) to access the OSI environment. Presentation layer provides for the selection of a common syntax for representing data. (73) layer provides the means necessary for cooperating presentation entities to organize and synchronize their dialog and to manage their data exchange. Transport layer provides a reliable end-to-end data transfer service. Network layer provides for the entities in the transport layer the means for transferring blocks of data, by (74) and switching through the network between the open systems in which those entities reside. Data link layer provides services to transfer data between network layer entities. Physical layer provides the mechanical, electrical, functional, and procedural means to establish, maintain and (75) physical connections for transfer of bits over a transmission medium.

（72）处填（）。

A．procedures

B．processes

C．courses

D．schedules
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