The representative samples were ( )at random. A. being drawn B. drawing C. drawn D. draw
The representative samples were ( )at random.
A. being drawn B. drawing C. drawn D. draw
A. being drawn B. drawing C. drawn D. draw
参考解析
解析：
相关考题：
According to Paragraph 4, the stress women confront tends to be[A] domestic and temporary.[B] irregular and violent.[C] durable and frequent.[D] trivial and random.
According to Paragraph 4, the stress women confront tends to beA．domestic and temporary.B．irregular and violent.C．durable and frequent.D．trivial and random.
He sometimes employs students to () samples of their products. A.distributingB.distributeC.have been distributedD.to distribute
After having seen the()and samples, Jenny makes the specific inquiry.A、 categoryB、 catalogueC、 calculation
听力原文：The foreign banks should have set up a representative office in China two years before they can apply for a branch.(2)A．The foreign banks should have set up a representative office.B．The foreign banks can't apply for a branch.C．The foreign banks can't expand business in China.D．The foreign banks are forbidden to set up a representative office.
Your samples should give us some idea of the colors and quality () the productsA、forB、withC、onD、of
PowerPoint2003提供的演示文稿设计模板的位置在( ) A: Microsoft Office Samples演示文稿设计B: Microsoft Office Templates演示文稿C: Microsoft Office Samples演示文稿D: Microsoft Office Templates Presentation Designs
有以下程序： #includeiostream usingnamespacestd； classsample { private： intX； public： sample(inta) { X=a： } frienddoublesquare(samples)； }； doublesquare(samples) { returnS．x*S．X： } intmain（） { samples1(20)，s2(30)； coutsquare(s2)endl； return0； } 执行结果是（ ）。A.20B.30C.900D.400
根据下面资料，回答题 I′ve often wondered how exactly sleep, or lack of it, can have such an awful effect on our bodies and, guess what, how much we sleep switches good genes on and bad genes off. In the first half of 2013, the Sleep Research Centre at the University of Surrey found a direct link between hours spent sleeping and genes. Every cell in our bodies carries genetic instructions in our DNA that act as a kind of operating handbook. However, each cell only "reads" the part of this handbook it needs at any given moment. Can sleep affect how a gene reads instructions It′s a question asked by Professor Derk-Jan Dijk at the University of Surrey. He set up an experiment and asked his volunteers to spend a week sleeping around seven and a half hours to eight hours a night and the next sleeping six and a half to seven hours. Blood samples were taken each week to compare which genes in blood cells were being used during the long and short nights. The results were rather surprising. Several hundred genes changed in the amount they were being used, including some that are linked to heart disease, cancer, and Type 2 diabetes. Genes to do with cell repair and replacement were used much less. Sleep restriction (six and a half to seven hours a night) changed 380 genes. Of these,220 genes were down regulated (their power was reduced), while 160 were up regulated (their power was increased). Those affected included body-clock genes which are linked to diabetes. One of the most downgraded genes is that which has a role in controlling insulin and is linked to diabetes and insomnia. The most upgraded gene is linked to heart disease. So changing sleep by tiny amounts can upgrade or downgrade genes that can influence our health and the diseases we suffer from when we sleep too little. The important message is that getting close to eight hours of sleep a night can make a dramatic difference to our health in just a few days through the way it looks after our genes. What can we learn about Professor Derk-Jan Dijk′ s experiment 查看材料A.The experiment was carried out to find the answer to how genes affect sleep.B.The experiment took a period of more than two weeks to reach a conclusion.C.His volunteers were divided into two groups with two different sleeping patterns.D.Blood samples of the volunteers were checked afterwards to decide how many genes changed in sleeping.
多因素方差分析应选择的操作菜单是（）A、Analyze→General Linear Model→UnivariateB、Analyze→Compare Means→One-Samples T TestC、Analyze→Compare Means→Independent-Samples T TestD、Analyze→Compare Means→One-Way ANOVA
What stanza file does a system administrator view to determine what kernel-tuning parameter changes were made when the system was last booted？（）A、/etc/rc.netB、/etc/tunables/tuningC、/etc/tunables/lastbootD、/usr/samples/kernel/nextboot
单选题What stanza file does a system administrator view to determine what kernel-tuning parameter changes were made when the system was last booted？（）A/etc/rc.netB/etc/tunables/tuningC/etc/tunables/lastbootD/usr/samples/kernel/nextboot
单选题单因素方差分析应选择的操作菜单是（）AAnalyze→Compare Means→MeansBAnalyze→Compare Means→One-Samples T TestCAnalyze→Compare Means→Independent-Samples T TestDAnalyze→Compare Means→One-Way ANOVA
单选题PowerPoint提供的演示文稿设计模板放在（）。AMicrosoft Office/Samples/演示文稿设计BMicrosoft Office/Templates/演示文稿CMicrosoft Office/Templates/Presentation DesignsDMicrosoft Office/Samples/演示文稿
单选题两个独立样本t检验应当选择的操作菜单是（）AAnalyze→Compare Means→MeansBAnalyze→Compare Means→One-Samples T TestCAnalyze→Compare Means→Independent-Samples T TestDAnalyze→Compare Means→Paired-Samples T Test
单选题The representative of the committee was asked to verify his earlier statement.AconfirmBwithdrawCrepeatDmodify
单选题The representative of the company demanded that part of the agreement ______ revised.Awill beBisCto beDbe
单选题Hoses used for cargo transfer operations must be tested and inspected at specified intervals by（）.Aa representative of the Captain of the PortBthe operator of the vessel or facilityCa representative of the National Cargo BureauDlow inert gas temperature
单选题Hoses used for cargo transfer operations must be tested abdinspected at specified intervals by （）.Aa representative of the Captain of the PortBthe operator of the vessel or facilityCa representative of the National Cargo BureauDa representative of the American Bureau of Shipping
问答题A typist types four envelopes and four letters. She places the letters in the envelopes at random. What are the chances that only three letters are in their correct envelopes?
名词解释题代表性样本（representative sample）