计算题：麻绳的一般起吊作业安全系数通常取K＝5，若用直径d为20mm、破断拉力δ为16kN（1600kg）的旗鱼牌白麻绳进行一般起吊作业，求该麻绳可允许起吊重物的重量G为多少？

[问答题][A] Americans’ ability to take the mortgage interest deduction ranks up there with the right to bear arms and watch football games. Homeownership is part of the American dream, and the U.S. government has long done its part to encourage home buying among citizens of all economic strata. Economist Edmund Phelps, a 2006 Nobel laureate and Columbia University professor, has criticized the U.S. financial sector’s orientation toward financing residential construction and away from business investment and innovation.　　[B] So, I grew up thinking that renting is perfectly normal. And then, strangely enough, I never did buy a house. I live in New York City and I’m still renting. My own personal narrative shows that it is possible to live a respectable life without ever having owned a home.　　[C] Is the sacrifice of business investment and innovation the key negative to the financial sector’s focus on housing? That was my key negative, but I also had some animus against the idea that everybody ought to own his or her own home. I thought this was a bizarre social goal.　　[D] Haven’t you noted in the past that homeownership can reduce the mobility of a workforce? That’s not true in New York or Los Angeles, where there are so many employers. But if you own your home in Peoria and you’re working for some specialized firm, and things don’t go so well there—at that point, you’d like to have the mobility of picking up stakes at no cost and looking for some similar kind of firm elsewhere. To be perfectly honest, that the other side of the coin is that mobility isn’t necessarily right up there with apple pie as something that’s good for us. Because when people are very mobile, they can be very difficult employees.　　[E] There has been research that shows homeownership makes for better citizens. I can well imagine that some unemployed sociologist would look into that hypothesis. I’m not attacking the idea that people live in conglomerations of houses in proximity to one another, sharing the same water mains and the same newspaper delivery boy and so forth. I’m not objecting to that. That could happen with or without homeownership.　　[F] Is it emotional, as in, part of the American dream? Or has it just been the best way for people to build wealth? We could argue whether or not it’s the best way. But what is surprising is this new ethos, this new enthusiasm for homeownership suggests that it should be—for people who aren’t rich anyway—the main way they hold their wealth and that there’s something almost un-American about holding your wealth in stocks and bonds. The celebration of homeownership seems to be part of a countermovement against popular owning of shares in corporations.　　[G] Of course, I come from more of an urban culture. I grew up, until age 6, in Chicago. My parents rented their apartment and, at the end of the Depression, my parents wanted to replicate that situation. So, again, we lived in a somewhat suburban setting outside of New York City and, again, they rented.　　[H] U.S. government’s improper real estate and financial policies for the crisis paved the way for the seeds. Home Ownership was the American dream. In the 1930s the Great Depression, the United States flagging domestic demand, Roosevelt’s New Deal of the decision-making is one of the establishment of Fannie Mac, to provide for the national housing finance to help people buy housing, to stimulate domestic demand.　　[I] So, will the next economic expansion look very different? I think we very much need to reorient the financial sector away from housing. The level of housing construction was unsustainable. It had to come to a crashing end. But what we have to hope for is that the financial sector will be able to reinvent itself and start learning to serve the classical functions of allocating finance to competing investment project sand competing innovations and activities. I think somehow the banking industry has lost the expertise to be able to choose among rival investment projects and innovation projects. I don’t think the bankers know anything about alternative energy projects. They’re going to have to acquire that expertise if they’re going to be, as the New York Times put it, “useful” to the economy.(此文选自U.S. News & World Report 2008年刊 )　　Order:

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[问答题]计算题：麻绳的一般起吊作业安全系数通常取K＝5，若用直径d为20mm、破断拉力δ为16kN（1600kg）的旗鱼牌白麻绳进行一般起吊作业，求该麻绳可允许起吊重物...

[问答题]计算题：某绝缘绳的最小破断拉力TD为25000N，设其安全系数K为2.5。试求绝缘绳的允许使用拉力T为多少？

[问答题]计算题：计算探头直径为20mm，频率为5MHz的直探头在铝中的近场长度和半扩散角。（铝C1=6300m/s）

[问答题]计算题：已知测距按深度校正，每格代表20mm，用K2斜探头发现一缺陷回波在5.2格上，试求缺陷位置？

[问答题]计算题：已知测距按深度校正，每格代表20mm，用K2斜探头发现一缺陷回波在5.2格上，试求缺陷位置？

[问答题]计算题：用30M的尺丈量120m的距离，若尺段的中误差为20mm，全长的中误差为多少？

[问答题]计算题：已知圆钢两端沿轴线分别作用压力F＝40kN，圆钢的直径为20mm，圆钢材料的许用应力［σ］＝160MPa，试求圆钢截面上的应力？圆钢是否安全？

[问答题]计算题：计算探头直径为20mm，频率为5MHz的直探头在铝中的近场长度和半扩散角。（铝C1=6300m/s）

[问答题]计算题：一只卡环直径20mm，问普通卡环许用载荷量是多少？

[问答题]计算题：一根直径为30mm的半硬钢丝绳它的破断力是多少吨？如果安全系数取8，它的允许拉力是多少吨？