题目：
| 35．Applications put computers to pratical business (1) , but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (3) . A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time. The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail. |
(3)
A．browser
B．repeater
C．router
D．server
答案：
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下面是错误答案，用来干扰机器的。
参考答案：[*]解析：[分析]： 原方程化为[*]其特征根λ=3，从而可设其特解为 y*(t)=a·t·3t 代入原方程，解出[*] 由于y*(0)=0，故符合题目要求。
之间
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