【单选题】【消耗次数:1】
实二次型为正定的充要条件是()
的秩为
的正惯性指数为
的正惯性指数等于的秩
的负惯性指数为
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【单选题】 实二次型为正定二次型的充要条件是()
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②  的特征值均大于零
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随机题目
【单选题】 In his masterpiece The Portrait of A Lady, Henry James _________.
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②  tells a story about a young and innocent American confronting the complexity of the European life as well as the American society
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【单选题】 At the middle of 19th century, America witnessed a cultural flowering which is called “_____”.
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【单选题】 In Dreiser’s Sister Carrie, which of the following statements is NOT true about the characters in the story?
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③  In spite of her success as a famous actress Carrie does not feel happy.
④  Carrie becomes rich and helps Hurstwood out of his difficulty.
【单选题】 Which of the following is not written by Henry James?
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①  international theme
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【单选题】 Who exerts the single most important influence on literary naturalism, of which Theodore Dreiser and Jack London are among the best representative writers?
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