题干

设集合U={(x,y)|y=3x﹣1},A={(x,y)|
y
2
x
1
=3},则∁UA=____
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答案(点此获取答案解析)

{(1,2)}

同类题1

阅读理解

    Sambodromo Samba Parade tickets for Rio carnival

    Order on this page your Rio Carnival tickets for the Samba Parade in Rio's Sambodromo.

    Benefit from our unique advantages. Read the Sambodromo ticket and order description first.

Covered Grand Tier Boxes—Yellow on the map

    The boxes in Sector 7 have been covered to offer an enjoyable Parade experience even in the rain. These boxes are more comfortable than the other boxes since the 12 seats are cushioned(带坐垫的)and they also have a coffee table.

    Price for per seat is $ 70.

    Luxury Suite Lounge Carioca—Purple on the map

    The goal of Lounge Carioca in Sector 5 is to reach those who look for a new product to attract, conquer and make new business. It has privileged location -the center of the Avenue! In our cabin we will have ample and comfortable space for our guests to watch the parades in a unique structure.

    Price for per seat is $ 90.

    Luxury Suite Lounge Folia -Red on the map

    This leisure area between Open Front Boxes of Sector 6 and 8 is for 1,000 rather-party-minded people and contains a beauty salon, a dance floor with DJs and has some space also to relax and watch the Parade on a giant screen.

    Price for per seat is $ 100.

    Luxury Suites -Blue on the map

    These covered boxes in Sector 9 are the best places. They are at the right height to offer the perfect view of the Parade, being above the front boxes. You can buy individual seats in the desired suite or rent a whole suite for a particular night.

    Price for per seat is $ 120 and $ 260 for a whole suite.

同类题4

阅读下面两则材料,完成1—3题。

【材料一】


 南水北调工程,是缓解我国北方水资源严重短缺局面的战略性基础设施,分东、中、西三条线路。东线、中线一期工程已分别于2013年和2014年通水,以南方充盈之水 (滋润  滋养)北方干渴大地的梦想已经实现。南水北调工程将发挥显著的社会效益、生态效益和经济效益。以中线一期工程为例,输送的距离长,流经的范围广,沿线经过多个大中城市,每年可输送的调水量达95亿立方米,相当于黄河水量的1/6,直接受益人口达6000万。根据需要,后期将进一步扩大调水规模,减少地下水开采,使水生态恶化的趋势得以缓解。随着受水区水资源生态的改善,影响北方经济发展的“瓶颈”将逐步消除,从而为这些地区经济结构调整创造机会和空间。

【材料二】

    2014年12月27日,北京市南水北调工程正式通水。南水北调工程年均为北京送水12.4亿立方米,供水范围达6000平方公里,成为北京的主力水源,城市供水保证率将由75%提高到95%。此外,南水北调工程通水后,不仅减少北京重要水源地密云水库的出水量,还可以将富余来水调入密云水库存蓄,大大加强北京水资源战略储备。南水北调工程通水后,北京将逐步关闭大部分自备井,通过天然和人工  (回填  回补),有效遏制地下水位的大幅下降。同时,部分来水还可向首都的河湖补充清水,增强水体的稀释自净能力,改善河湖水质。