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【判断题】
任一矩阵,矩阵行秩等于矩阵列秩等于矩阵的秩。
【单选题】
设矩阵的秩为,为阶单位矩阵,下述结论中正确的是()
【判断题】
反对称矩阵主对角线上的元素不一定等于零
【判断题】
设矩阵A中有一个不等于0的r阶子式D,且所有的r+1阶子式(如果存在的话)全等于0,那么D称为矩阵A的最高阶非零子式,该矩阵的秩为r.
【判断题】
非齐次线性方程组Ax=b有解的充要条件是系数矩阵的秩R(A)等于增广矩阵的秩R(A|b).
【单选题】
设矩阵A的秩为r,下列说法正确的是( )(A) 矩阵A的所有r阶子式都为零; (B) 矩阵A的所有r+1阶子式都为零;(C) 矩阵A至少有一个r阶子式为零;(D)矩阵A至少有一个r+1阶子式不为零。
【单选题】
设,AB都是n阶非零矩阵,且 AB?0,则A和B的秩( )
【单选题】
The old couple, whose kids have all passed away, have to ( ) only with their small pensions.
【单选题】
His handsome look, elegant taste, manners of gentleman, and ( ) knowledge in history and economy all intoxicated his pupils.
【单选题】
Bank of China has ( ) the other rivals by raising its offer.
【单选题】
The leakage of the concrete ( ) of the contract between the two corporations has aroused much concern and a heated discussion in local residents.
【单选题】
A ( ) is a second-year student in college, which means “student with more wisdom”.
【单选题】
Initiative and spirit of ( ) are two key elements that ensure the rapid but steady progress of the corporation.
【单选题】
Nancy ( ) the egg over in the pan
【单选题】
The young CEO lost his confidence and felt that hes an ( ).
【单选题】
Earthquakes ( ) in the region about once a week, without the people feeling them.
【单选题】
After the break, the class resumed with ( ) spirit.