重复抽样是指从总体中抽取一个元素后，把这个元素放回到总体中再抽取第二个元素，直到抽取n个元素为止。()

未分类题Why did the market fail to work its usual magic on human kidneys?A．The theory of demand and supply is not applicable here.B．Supply did not respond to high prices or meet fast growing demand.C．Supply of human kidneys depends on charity rather than market.D．Human kidneys are not such ordinary goods as shoes, clothes, etc.

未分类题According to Paragraph 4, which of the following is true about the debris?A．The white blood cells are ready to get rid of it all the time.B．It is the product of red blood cells during blood storage.C．It could help sports cheats avoid detection.D．It is fragments of cell membranes.

未分类题What would be the best title for the text?A．Blood Cell 'Debris' could Snare Sports CheatsB．A New Type of Blood DopingC．Several Measures Taken to Detect Blood DopersD．Antibodies are Created to Detect Blood Dopers

判断题对于连续变量，由于其变量值无法一一举例，所以更不能采用单项式分组，这种情况采用组距式分组。()

单项选择题在变容二极管电路中，中心频率fC为5MHz，调制信号频率为5kHz，最大频偏为2kHz。通过三倍频后，调频系数Mf为()。A、1.2B、2C、12D、15

未分类题According to the author, policies adopted by most countries are bad in thatA．they actually force citizens to donate organs.B．the presumed consent is not morally right.C．they fail to increase supply to an expected level.D．people donate organs because it is voluntary.

未分类题Schools considered using summer time most probably because theyA．wanted to help students to make full use of the school calendar.B．disbelieved that their students would actively do summer homework.C．would like to encourage more students to take Advanced Placement tests.D．thought achievements had something to do with efforts in summertime.

判断题评价结果要客观可靠，追求评价的客观性是现代教育评价的基本特点。评价包括描述和价值判断。()

未分类题Peter Singer seems to suggest thatA．we should cast away our logic and respect emotion in the first place.B．we should not only concern about ourselves but start help each other.C．people who live in abundance should give a hand to those in poverty.D．we should cut off life support for the old to achieve the utilitarian goals.

判断题每一个D、FA都对应有唯一的一个NFA。()

未分类题The difference between modern cell phones and old phones lies in thatA．it requires more intelligence and education to use modem cell phones.B．it takes more weeks to get familiar with modem cell phones.C．modem cell phones are more complicated with many functions.D．modem cell phones are more mysterious tools for people.

未分类题The researches held by Motorola showed that the textually illiterate villagersA．were willing to use old machines with little functions.B．had to take some lessons to learn the new functions.C．could remember the major function of each button.D．would avoid reading the hierarchy menus of the machine.

判断题两个正规式等价，当且仅当它们所描述的正规集相同。()

未分类题Fogg believes that the future mobile phones could notA．teach illiterates to learn alphabets.B．understand the user's ideas and points.C．help users exercise their languages.D．become more direct and elegant.

未分类题It is stated in Paragraph 4 that those who support pushing the bystander to stop the trolleyA．are brutal and relentless.B．display the same emotional aversion.C．feel guilty about doing that.D．have struggled to make the decision.