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题目：
多选题
A固定金额还款
B最低还款金额还款
C固定比例还款
D全额还款
答案：
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变流器工作在逆变状态时，如果把变流器的交流侧接到交流电源上，把直流电逆变为同频率的交流电反馈到电网去，叫作有源逆变
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人差方程式
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IPv4地址是（）位，IPv6地址是（）位。
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危害识别与风险评估的目的是为了评价（）的可能性及其后果的严重程度。
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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. In India people with light skin and good feature are preferable.（）
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随着沟通南北东西的大运河体系的开通，一系列大小城市沿河兴起。在宋代，称得上当时最富裕的城市有（）（）。
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寄库款箱和领解现款箱采用（）予以区分。
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为实现能源的低碳可持续发展，未来需要采用特髙压技术构建泛欧洲骨干网架，建设（），保障可再生能源的高效接入与消纳。
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大量的教育教学实践证明，教师的教育设计合理、方法运用得当，对激发幼儿的活动兴趣，促进幼儿各方面的发展没有直接影响。()
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为了提高混凝土的粘聚性，降低泌水，下列说法错误的是（）