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已知x>0,y>0,2x+y=3,则xy的最大值为( )
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某学科的一次练习中,第一小组5个人成绩如下(单位:分):98,89,70,92,90,则分数的样本方差为__________.
两圆①(x-a)2+y2=1与②x2+(y-b)2=1外切的充要条件是( )
为了考察某种小麦的长势,从中抽取10株苗,测得苗高如下(单位:cm):12,13,14,15,10,16,13,11,15,11. 则该品种的小麦苗高的样本方差为__________cm2.
从1到9这九个数中。任取三个数作为数组(a,b,c),且a
若方程x2+(m-3)x+m=0的两根都是正实数,则m的取值范围是( )
已知A(-1,-1),B(3,7)两点,则线段AB的垂直平分线方程为__________.
抛物线x2=-2y+2(??)
函数?(x)=(x2-1)3+1的最小值为( )
数列{an}的通项公式为an=3n,则{an}( )
函数?(x)=x3-6x2+9x在区间[-3,33上的最大值为__________.
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1.
Directions:There are five reading passages in this part. Each passage is followred by four questions. For each question there are four suggested answers markedA, B,C and D. Choose the best answer and blacken the corresponding letter on the A nswer Sheet.Passage One Debate is a valuable way to practise communicating. It can a1so bring long lasting rewards, especially for people working with Western businesses. The main activity of debate is presenting one’ s opinion and suppmting it with evidence, such asstatistics or facts. It is a way of per suasive communication.Charles Lebeau helped create the' Discover Debate" method. He says debate is important to understanding how people communicate in Western business. Successful debaters learn how to give their opinkm, reasans and support.^ What we are trying todo is to develop a kind of thinking or approach to discussion and how to inter act(交流) with someone else' s opinion, rather than brush their opinion aside.Debate skills are also important in selling a product, he says. In that si tuation, the judges are the customem." So on Monday, for example, one company may come in and present their case to the customer and they" 11 make as strong a ease as they can. 0n Tuesday, the next day, another company will come in and present their ease to the customer. Usually the party that can present the strongest case wins”Debate also strengthens critical thinking. In other words, it helps students 1 earn to ask questionsand try to understand someone’ s reasons and evidence. lift .Lebeau points out that successful debaters learn to listen carefully to what other people are saying. Then, they look for the weak points in someone else’ s opinionor argument. He says debate teaches a systematic way of questioning.Successful debaters also learn to think from someone else' s point of view. Mr. Lebeau says debate can help broaden the mind." There's an expression in English : don' t criticize another person before you have walked in their shoes. I think the wonderful thing about debate is, it puts us in another person’ s shoes.
2.
氧气对水生动物来说,属于( )
3.
14.期望理论可以用公式M=V·E 表示,其中 V 代表
4.
在控制条件下以人为的改变某些变量(自变量)来观测其它变量的变化的方法是( )
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普通合伙企业合伙人李某因车祸遇难,生前遗嘱指定16岁的儿子李明为其全部财产继承人。下列表述错误的是( )
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