关系模式规范化的最起码的要求是达到第一范式，即满足（ ）。A．每个非码属性都完全

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).

（75）处填（）。

A．application

B．session

C．physical

D．transport

同一份停役申请的部分设备检修结束，经验收合格需提前复役（或其余设备不能如期复役）时，变电所值班员或相应县调应及时办理原申请的工作终结手续，并将详细情况向值班调度员汇报。检修单位不需对仍需工作的检修设备（项目）重新办理申请和相应的许可手续。

相互独立的随机变量X₁和X₂均服从正态分布

，则D(|X₁-X₂|)=______．

做肛管排气，下述哪项不妥

A．助患者仰卧或侧卧位
B．保留肛管1h
C．肛管所连接的橡胶管末端插入水瓶中
D．按结肠解剖位置做离心按摩
E．肛管插人直肠17cm

胶辊产生机械波的主要原因有（）

A、胶辊轴承磨损

B、涂料不匀

C、胶辊划伤

D、加工质量差