【11】 是实现C++语言编译时多态性的机制， 【12】 是实现C++语言运行时多

For users, microkernel technology promises (90) , compact and sophisticated operating systems that are typically (91) across a range of hardware platforms. These operating systems will be customizable to let users run multiple operating system and application "personalities" on top of a single microkernel (92) .

Microkernel based systems can provide this flexibility because the core operating system functions are (93) from the large number of utilities, features and extensions that are layered on top of them. As a result, updating and maintaining operating system is easier, since developers don’t have to modify the (94) every time they must acid a new feature.

（94）是（）

A.core

B.center

C.heart

D.utility

冷却塔的除水器要求包括______。

A．除水效率高

B．通风阻力小

C．便于安装

D．经济耐用

红外线是直线传播的。

侧路代送主变压器操作主要危险点有（）。

A.侧路与所带主变不在同一条母线，造成有关保护误动

B.未按所带主变核对保护定值投入保护，造成保护误、拒动

C.切换电流互感器切换片时，造成短路

D.误停与主变断路器共用电源的主变保护

E.未按规定退出主变差动保护及侧路零序保护

F.未投入主变相关保护跳旁路压板，造成主变失去保护

在党的十八大上，代表十七届中央委员会向大会作报告的是（）。

A.江 * *

B.胡 * *

C.温 * *

D.习 * *