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问题 单项选择题

关于水的描述正确的是（）。

A.成人一天需要补充约2000～2500mL的水量

B.水占成人体重的80%以上

C.在体内能使体温保持稳定

D.水是润滑剂

答案

参考答案：C

解析：水占人体体重的50%-60%，人体的一切生物化学反应都必须在水的介质中进行。其功能包括溶解物质、运输营养、维持体温和渗透压以及产生润滑作用。

单项选择题

TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines (73) that applications need--like the ability to transfer a file in the case of HTTP. In short,

the application layer provides an (74) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (75) layer consists of two main protocol options--the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

（74）处填（）。

A．iteration

B．object

C．interface

D．activity
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问答题 简答题

进度计划编制依据主要有哪些？
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