数字控制系统较之一般连续控制系统具有如下优点,包括()。 A.数字计算机能够保证足够

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问题:

数字控制系统较之一般连续控制系统具有如下优点,包括()。

A.数字计算机能够保证足够的计算精度

B.采用高精度检测元件,能够提高整个系统的精度

C.可以采用分时控制方式

D.数字信号的抗干扰能力好,可以提高系统的抗干扰能力

考点:自动控制原理自动控制原理题库
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城市经济社会发展规划

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我国民间传统三大节分别是哪些?

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UPS的中文译名是( )。

A.稳压电源

B.不间断电源

C.高能电源

D.调压电源

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Home prices slid in November, raising questions about whether the housing recovery is robust enough to maintain a sustained turnaround. From October to November, home prices fell 0.2% after (1) 0.1% in October, according to a report Tuesday by Standard & Poor’s/Case-Shiller’s home price index. (2) five of the 20 metro areas (3) by the index saw price increases for the month.

On a(n) (4) basis, prices were 5.3% lower in November than in November 2008. Prices were the same as in late 2003. "What we’ve seen (5) the past couple of months is that the pace of (6) has fallen down," says Maureen Maitland of Standard & Poor’s. "Some markets have (7) Is that because we haven’t (8) the foreclosure (回赎权的取消) cycle Because of unemployment We’re not seeing the (9) we were seeing in the last summer months. "

Metro areas that have seen a retreat in home prices (10) Seattle, Charlotte, Las Vegas and Tampa. All four (11) gains they made in recent months (12) . (13) , for the 20-metro index, the annual rate of decline is improving. That (14) , with other recent housing reports that show prices (15) or accelerating, could point to (16) the housing market is starting to (17) its footing, some economists say. Existing home sale prices were $178 300 in December, which is 1.5% higher than December 2008, according to a report this week by the National Association of Realtors. That was the first year-over-year (18) in median price since August 2007.

"The most (19) thing we can say is not only the market is stabilizing, but we’ve seen that housing demand is p," says Bernard Baumohl, with the Economic Outlook Group. "Housing probably will continue to climb upwards through the summer, (20) it could slip a little as the tax credit expires. \

15()

A.fluctuating

B.stabilizing

C.declining

D.inclining

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由于缺少润滑、工作频繁及打反车等,会使齿形联轴器(),重物坠落。

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