案例分析题

Applications put computers to practical business （） , but below the （） it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store （） .
A traditional kernel provides all the functions for applications. The kernel （） memory, I/0 devices and parcels out processor time.
The kernel also supports security and fault （） , which is the ability to recover automatically when parts of the system fail.

The kernel （） memory, I/0 devices and parcels out processor time.