【单选题】【消耗次数:1】
二次型的秩为()
都不对
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相关题目
【单选题】 实二次型为正定二次型的充要条件是()
①  的特征值均大于等于零
②  的特征值均大于零
③  任意阶子式均大于等于零
④  任意阶子式均大于零
【判断题】 实二次型只有正定二次型和否定二次型两种
①  正确
②  错误
【单选题】 实二次型为正定的充要条件是()
①  的秩为
②  的正惯性指数为
③  的正惯性指数等于的秩
④  的负惯性指数为
【单选题】 二次型是()
①  正定的
②  半正定的
③  负定的
④  不定的
【判断题】 任何实二次型都可以化成一个标准二次型
①  正确
②  错误
【判断题】 二次型的矩阵一定是对称矩阵
①  正确
②  错误
【多选题】 下列属于燃料型二次能源的是()。
①  A.焦炭
②  B.甲醇
③  C.热水
④  D.激光
【单选题】 下列矩阵中,不是二次型矩阵的是()
①  <imgwidth="94"height="84"v:shapes="_x0000_i1192"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image213.png">
②  <imgwidth="94"height="84"v:shapes="_x0000_i1193"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image215.png">
③  <imgwidth="106"height="84"v:shapes="_x0000_i1194"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image217.png">
④  <imgwidth="86"height="84"v:shapes="_x0000_i1195"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image219.png">
【单选题】 二次型<imgwidth="230"height="28"v:shapes="_x0000_i1248"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image251.png">的秩为()
①  <imgwidth="38"height="18"v:shapes="_x0000_i1249"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image253.png">
②  <imgwidth="42"height="18"v:shapes="_x0000_i1250"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image255.png">
③  <imgwidth="40"height="20"v:shapes="_x0000_i1251"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image257.png">
④  都不对
【多选题】 “二次作品”中的二次创作方式包括:
①  A.改编
②  B.翻译
③  C.注释
④  D.整理
随机题目
【单选题】 8.____ is a fact that English is beingaccepted as an interesting language.
①  There
②  This
③  That
④  It
【单选题】 9. He feels _______ duty to help others.
①  that he
②  that his
③  it he
④  it his
【单选题】 6. Was it in this palace________ the last emperor died?
①  that
②  in which
③  in where
④  which
【单选题】 Is ______necessary to complete the design before National Day?
①  this
②  that
③  it
④  he
【单选题】 3.Idontthink_____possibletomasteraforeignlanguagewithoutmuchmemorywork.
①  this
②  that
③  its
④  it
【单选题】 This is a big class, and ______ of the students are girls.
①  two third
②  second three
③  two thirds
④  two three
【单选题】 3.Iveread_______sportsnewsabouttheF1racetoday.
①  two
②  pieces
③  two pieces
④  two pieces of
【单选题】 8. Bill saidthey would have _________ holiday.
①  a two-month
②  two months
③  two-months
④  two months
【单选题】 4.—CanIhelpyou?—Idlike________formytwindaughters.
①  two pair of shoes
②  two pairs of shoe
③  two pair of shoe
④  two pairs of shoes
【单选题】 10.I spent __________ in doing my homework yesterday.
①  a half and two hour
②  two and a half hour
③  two hour and a half
④  two and a half hours