正规文法不能产生语言L={anbn|n≥l｝。()

未分类题According to the text, 'rational choice' holds thatA．decision making is not linked with wisdom in a sense.B．happiness relies on short-term individual gains.C．individual happiness harms the broad interests of society.D．individual fates change with reckless greed.

单项选择题对服毒的病人解毒在服毒后几小时内洗胃效果最佳( )。

未分类题According to the first two paragraphs, the 'improbable ambition'(Line 1, Paragraph 2)isA．to make Middlesbrough boom on steel and chemicals again.B．to revive the traditional industries in Middlesbrough.C．to revive Middlesbrough with glitz and glamour.D．to build an expensive gallery in Middlesbrough.

未分类题By saying 'Middlesbrough lost its heart years ago'(Line 3, Paragraph 3), Ray Mallon implies that the town has lostA．its confidence a long time ago.B．its attraction a long time ago.C．an important organ long ago.D．its way a long time ago.

判断题有穷自动机能够识别上下文无关语言。()

未分类题Money from outside the town is quite needed becauseA．few people will pay a visit to Middlesbrough Institute of Modern Art.B．the local unemployment rate is high and business registration rate is low.C．many people will choose to go to Newcastle to experience culture.D．the town suffers the high unemployment rate—twice the national average.

判断题样本均值分布式一个特殊的总体分布。()

未分类题It can be inferred from the first paragraph thatA．the 1957 influenza infected 250,000 people in AmericaB．Asia was the cradle of the 1957 influenza pandemic in America.C．Maurice Hilleman went to Asia to Collect the sample of the influenzaD．it was quite time-consuming to study the genetic structure of the influenza

判断题原始分数和Z分数之间的转换过程实际上就是对分布轴的一种重新标定。()

未分类题The word 'footnote'(Line 1, Paragraph 1)means that the influenza in 1957A．was less important in American medical history.B．imposed little influence on American population.C．was less serious in terms of death toll.D．got less attention of American medical experts.

判断题文法的任意两个符号对之间都存在简单优先关系。()

未分类题Why have venture capitalists found it difficult to invest in wind power?A．Investment in the wind power market is highly risky.B．Development of wind power calls for new technologies.C．Wind power industry did not develop as fast as expected.D．Investment in wind power may not be so cost effective.

判断题叠音词色彩鲜明，富有美感，声情并茂，有它独特的修辞效果，在写诗词歌赋时，犹为古今作者所喜用。()

未分类题According to Mr. Greco, SWWPs new tribuneA．has already dominated the 'off-grid' market.B．will fail in the grid-connected market.C．is inclusive, economical and easy to operate.D．will become a more profitable product than others.

单项选择题我国在制度中正式将“待业救济金”改为“失业保险金”是在()