单项选择题

（）是研究作用在液体上的力与运动要素之间的关系，以及液体运动的基本规律。

A.水静力学
B.水动力学
C.土动力学
D.土静力学

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单项选择题

You install a custom application on a computer that runs Microsoft Windows XP. The application stores each user’s data in the %programfiles%\app1\data folder on the computer. You install the custom application on a computer that runs Windows Vista.
On the Windows Vista computer, you back up the %programfiles%\app1\data folder and notice that the backup contains no data.
You need to back up the application’s user data on the Windows Vista computer.
What should you do?（）

A.A
B.B
C.C
D.D

多项选择题

What are two requirements to perform a warm Cisco IOS upgrade on a Cisco ISR router? （）(Choose two.)

A. at least one enabled Ethernet interface
B. Cisco IOS version 12.3(2)T or greater
C. enough memory to decompress the new Cisco IOS image
D. internal flash memory equaling two times the space required for the current Cisco IOS image