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已知a= （1 ，0 ，-1 ），b= （1 ，-1 ，O ），单位向量n 满足n ⊥a ， n ⊥b ，则n=
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已知a= （1 ，0 ，-1 ），b= （1 ，-1 ，O ），单位向量n 满足n ⊥a ， n ⊥b ，则n=
或
| 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．design
B．designed
C．designing
D．designs
