母线的作用有（）、分配和（）电能。

He devoted all his life to _____ novels.[ ]

A. write

B. writing

C. write with

D. writing with

A、B、C、D、E为短周期元素组成的中学常见物质，它们转化关系如图所示（部分产物、条件略去）．下列说法正确的是（　　）

A．若C为二氧化碳，则E可以是强碱也可以是强酸

B．若D为白色胶状难溶物，且与A摩尔质量相等，则E为一常见气体单质

C．若E为氢气，则A一定为金属单质钠

D．若A为金属单质，则X一定为二氧化碳

传输设备设计勘查在空间设计方面要求有（）。

A.空间设计须合理，设备机架的安装布局尽可能的考虑性能特点的同时还要注意与机房原有设备的整齐排列、整体美观

B.空间高度、尺寸必须准确，符合要求

C.参照物、基准、标示要定位准确

D.对机房空间的净高一定要标示准确

With hundreds of millions of electronic transactions taking place daily, businesses and organizations have a p incentive to protect the (66) of the data exchanged in this manner, and to positively ensure the identities of those involved in the (67) . This has led to an industry-wide quest for better, more secure methods for controlling IT operations, and for deploying p security (68) deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security. (69) that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in (70) and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.

A．silicon

B．reengineering

C．computer

D．software

下列哪一项，不属于公共定价法( )

A．加权平均定价法
B．平均成本定价法
C．二部定价法
D．负荷定价法