自我提高驱力

(21) put computers to practical business use, but below the surface it is the heart of an (22) - the kernel - that provides the technical wizardry to juggle multiple programs, connect to networks and store (23) .
A traditional kernel provides all the functions for applications. The kernel (24) memory, I/O devices and parcels out processor time.
The kernel also supports (25) and fault tolerance, which is the ability to recover automatically when parts of the system fail.

A．Databases

B．Applications

C．Drivers

D．Games

处方写桃杏仁应付（）

A.炒白术、炒白芍

B.大腹皮、生槟榔

C.猪苓、茯苓

D.桃仁、杏仁

E.赤芍、白芍

假设一国人口为1000万，就业人数为400万，失业人数100万，则该国的劳动力为（）万。

A．500

B．400

C．1000

D．100

颈动脉窦综合征的特点（）

A.可伴有抽搐

B.在体位骤变时发生晕厥

C.晕厥于咳嗽时发生

D.心率明显加快

E.血压升高

下列程序的循环次数是______。x=2;do{x=x*x;}while(!x);