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当前学科：建设工程项目管理
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某工程施工中，由于施工方在低价中标后偷工减料，导致出现重大工程质量事故，该质量事故发生的原因属于()。
A . 管理原因
B . 社会、经济原因
C . 技术原因
D . 人为事故原因
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Marriage Advertisements in India Every Sunday morning millions of Indians settle down with a cup of tea and special weekend issues of their newspapers, just as Americans do. But here, with the marriage season approaching, many of them quickly to a Sunday feature that is particularly Indian-the-columns of marriage advertisements in which young people look for husbands and wives. This is relatively modern change in the age-old custom of the arranged marriage. The thousands of advertisements published each week increasingly reflect social changes that coming to this traditional society. For example, although women are still described in terms of appearance, or skill in "the wifely arts", information about her earning power is entering more and more of the advertisements. This reflects the arrival in India of the working wife. Divorce, which used to be almost unheard of in India, is sometimes now mentioned in the advertisements as in the case of a woman whose advertisement in New Delhi newspaper explained that had been "the innocent party" when her marriage broke up. Because the custom of the dowry (marriage payment) is now illegal, some advertisements say "no dowry" or "simple marriage", which means the same thing. However, the fathers of many bridegrooms still require it. In a land where light skin is often regarded as socially preferable, many also require that a woman have a "wheat-color" complexion or that a man be "tall, fair and handsome". Advertisements are placed and eagerly read by a wide range of people in the upper classes, mostly in cities. Many of them receive dozens of answers."There's nothing embarrassing about it," explained a Calcutta businessman advertising a son-in-law. "It's just another way of broadening the contacts and increasing the possibility of doing the contacts and increasing the possibilities of doing the best one for one's daughter." Because of high unemployment and a generally poor standard of living here, one of the best attractions a marriage advertisement can offer is a permit to live abroad, especially in Canada or the United States. A person who has one can get what he wants. One recent Sunday in Madras, for example, a Punjabi engineer living in San Francisco advertised for a "beautiful slim bride with lovely features knowing music and dance". And a man whose advertisement said that he held an American immigration permit was able to say, only girls from rich, well-connected families need apply. The word "one" in "a person who has one can get what he wants" refers to good attraction.（）
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当允许速度Vmax≤120km/h时，作业人员下道避车时距钢轨头部外侧距离不小于（）。
外国（）航空器除非经中华人民共和国政府特许并遵守该项特许条件，不得飞入或者飞出中华人民共和国领域和在中华人民共和国领域内飞行。
关于钛及钛合金的说法，正确的是（）
颈椎病的手术指征是（）。
警察给酒后驾车的驾驶员一定罚款，此属于个人行为矫正中的（）
三尖瓣狭窄临床表现由体循环淤血而致（）。
秦汉臣下评议政事、陈述政见、弹劾官员的上行文是（）