题干

以下六个关系式:①0∈{0}②{0}⊇∅③0.3∉Q④0∈N⑤{x|x2﹣2=0,x∈Z}是空集,其中错误的个数是(   )

A:1

B:3

C:2

D:4

上一题 下一题 0.0难度 选择题 更新时间:2017-10-13 01:30:37

答案(点此获取答案解析)

A

同类题1

阅读材料,回答问题。
材料一  1933年,美国总统签署了《国家工业复兴法》,对恶性竞争的企业界、不适应生产力要求的生产关系、深陷贫困的劳工以及尖锐的劳资关系进行了规定,从而遏制生产过剩。“社会主义究竟是个什么样子,苏联搞了很多年,也并没有完全搞清楚。可能列宁的思路比较好,搞了个新经济政策,但是后来苏联的模式僵化。”
                                                                                                                                                                               ——邓小平
材料二 欧洲的分裂所造成的影响是灾难性的。……长达6年的战争苦难已使欧洲筋疲力尽,经济上衰弱的生存能力已使欧洲无法决定自己的未来。……完全失去了以往作为世界中心的地位和威望。20世纪60年代,西欧国家为提高在国际上的地位和作用,加强了经济上的联合……在以后40多年的时间里,欧共体(后为欧盟)成员国之间频繁协调,逐步取消关税,对困难的成员国提供援助,对外尽量“用一个声音说话”,进一步加强了政治上的联合。
材料三  20世纪50-70年代主要资本主义国家经济增长率简表
                                                       
(1)根据材料一中的两段材料,分别说出:20世纪30年代,美、苏、两国经济发展彤成怎样的模式?
(2)材料二中“长达6年的战争”使欧洲“完全失去了以往作为世界中心的地位和威望”,请你结合当时的世界局势的史实加以证明。
(3)根据材料二指出,欧洲联合的历程呈现出什么趋势?这种趋势对当今世界产生了什么影响?
(4)从材料三可以看出日本是经济增长速度最快的国家,这里的原因有很多,其中最具有长远战略眼光的是哪一条措施?
(5)当今世界各国都在埋首发展经济,那么你认为要想使各国经济都有相对良好的发展空间,摆在世界人民面前的首要任务是什么?

同类题4

阅读理解

    BEIJING — The launch of a new manned space mission brings China closer to the establishment of a permanent space station, international experts say.

    Chinese taikonauts, Jing Haipeng, 50, and Chen Dong, 37, were blasted off into space onboard Shenzhou-11 at 7:30 am Monday and will spend 30 days in the Chinese space laboratory Tiangong-2.The launch marks a key step toward China's plan to eventually operate a permanent space station. The successful launch of the Shenzhou-11 spacecraft is another step forward to put China among leading players in space technology, said Alexander Zheleznyakov, a Russian expert on history of space flights. China's experimental space lab will help provide solutions for spacecraft of different functions to approach and anchor, and for a long-term operation of life support system, said Zheleznyakov. Shenzhou-11 is scheduled to anchor on Wednesday with Tiangong-2, which is part of China's plan to build a permanent space station by 2022.

    China can now test technologies for cargo spacecraft anchoring, life support system operation and water recycling to ensure a long-term continuous operation of its space station in the future with less dependence on renewal from the Earth, he said. If all goes well, China will launch the unpiloted Tianzhou-1 cargo ship next spring to autonomously tie up with Tiangong-2. Tianzhou-1 will be capable of automatically transferring rocket fuels, a vital requirement for space station grouping and maintenance, according to a report by Columbia Broadcasting System (CBS).

    "That will further their anchoring abilities needed for the larger space station," Johnson Freese was quoted." Tiangong-2 is supposed to be able to stay in orbit for two years or longer, so that's taking them (Chinese) really close to 2019 or so. I think this will be their last big technology test phase before going to their large space station," said Freese.