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问题 选择题
下列说法正确的是（　　）

A．空气的流动不属于机械运动

B．只有机器的运动才是机械运动

C．任何物体如果以自身为参照物，它的速度就是零

D．参照物必须是绝对不动的物体

答案

答案：C

单项选择题

建立大数据安全管理制度，实行数据资源（）管理，保障安全高效可信应用。

A.安全评估

B.分类分级

C.监督运行

D.法律法规
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单项选择题

Applications put computers to practical business (67) , but below the (68) it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store (69) .
A traditional kernel provides all the functions for applications. The kernel (70) memory, I/0 devices and parcels out processor time.
The kernel also supports security and fault (71) , which is the ability to recover automatically when parts of the system fail.

A．used

B．use

C．apply

D．applied
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