文章：According to many analysts, labor-management relations in the United States are undergoing a fundamental change: traditional adversarialism is giving way to a new cooperative relationship between the two sides and even to concessions from labor. These analysts say the twin shocks of nonunion competition in this country and low-cost, high-quality imports from abroad are forcing unions to look more favorably at a variety of management demands: the need for wage restraint and reduced benefits as well as the abolition of "rigid" work rules, seniority rights, and job classifications. Sophisticated proponents of these new developments cast their observations in a prolabor light. n return for their concessions, they point out, some unions have bargained for profit sharing, retraining rights, and job--security guarantees. Unions can also trade concessions for more say on the shop floor, where techniques such as quality circles and quality-of-work­ life programs promise workers greater control over their own jobs. Unions may even win a voice in investment and pricing strategy, plant location, and other major corporate policy decisions previously reserved to management. Opponents of these concessions from labor argue that such concessions do not save jobs, but either prolong the agony of dying plants or finance the plant relocations that employers had intended anyway. Companies make investment decisions to fit their strategic plans and their profit objectives, opponents point out, and labor costs are usually just a small factor in the equation. Moreover, unrestrained by either loyalty to their work force or political or legislative constraints on their mobility, the companies eventually cut and run, concessions or no concessions. Wage-related concessions have come under particular attack, since opponents believe that high union wages underlay much of the success of United States industry in this century. They point out that a long-standing principle, shared by both management and labor, has been that workers should earn wages that give them the income they need to buy what they make. Moreover, high wages have given workers the buying power to propel the economy forward. f proposals for pay cuts, two-tier wage systems, and subminimum wages for young workers continue to gain credence, opponents believe the U.S. social structure will move toward that of a less-developed nation: a small group of wealthy investors, a sizable but still minority bloc of elite professionals and highly skilled employees, and a huge mass of marginal workers and unskilled laborers. Further, they argue that if unions willingly engage in concession bargaining on the false grounds that labor costs are the source of a company's problems, unions will find themselves competing with Third World pay levels-a competition they cannot win. 想请问郭老师，这题opponents观点是在第三段，但是原文和选项要怎么对照呢...怎么从观点看出态度？

有三组滑冰运动员，第一组全是single women，6个人，第二组是paired，3组，第三组是single men，5个人，他们的出场顺序是single women-paired-single men，问一共有多少种order？ （1）6+3+5 （2）6！*3！*5！ （3）6*3*5 （4）（6+3+5）！

一个数能被10^r 整除，不能被10^（r+1）整除，求r？ （1）这个数能被2^5整除，不能被2^6整除 （2）这个数能被5^6整除，不能被5^7整除

30个蓝球10个红球，摸一个放回去再摸一个，摸到两个颜色一样的就结束。第一个摸的是红球，问在摸到两个蓝球前摸到红球的概率是多少。

两个整数XY，问是否知道XY的值？ （1）X,Y的common divisor是（一个值） （2）X/Y=（一个值）

一个rectangular block，求表面积？ （1）each two面的面积是11，其中一边长（某个数） （2）一个边的边长是（某个数）

PS：俩骰子每面各是1-6，且每投一次各个数字冲上的概率一致。问同时扔这俩，俩加和是9或者5的概率？选了2/9。 老师您好，解析给是：共有6*6=36种，等于9的情况3+6,4+5,5+4,6+3。等于5的情况1+4,2+3,3+2,4+1。一共8个，所以是8/36=2/9。这是考虑了顺序的，8种情况是考虑到顺序，但我觉得不应该考虑顺序，应该只有4种。请指点。

一道数学机经题，没有具体数字麻烦老师讲下思路~~谢谢~~ DS： 有10个马拉松运动员平均成绩是2分32秒，问能否推出range？ 条件1：最快5个的range是XX 条件2：最慢5个的range是XX 构筑：不确定，选了e 构筑答案：E 整理菌答案：详见解析 解析: 整理菌列了几组数字来计算，感觉不能推出E。 但应该可以根据平均成绩以及人数，进行系统的计算。欢迎讨论！！

还是数学机经题~想问一下老师这个题不用反证法可以解吗？？或者反证法合理吗？？谢谢~~ DS：问h是不是prime number 条件1：h的factor都大于根号h 条件2：h的factor都大于h/2 反证法： 假设h = a*b 且a, b >1， h不是质数。 条件1： a，b>根号h，then H > 根号h*根号h = h， 推出矛盾，所以h不能写成两个大于1的数相乘，所以h是质数； 条件2： 同理 H>2/h*2/h=h^2/4 推出h<4, then h = 2 or 3, 是质数， 与假设矛盾。所以h是质数。 选D

有一个矩形的green sport field，长为L，宽为W，周围是一圈walking trace，宽为d，其中四个角是矩形的，面积分别为半径为d的圆形的4分之1，求walking trace的面积 条件1：矩形周长是36 条件2：d=20

平行四边形边长为6，面积为18，求角度可能是以下哪个？ 30 45 60 90 120