若[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]为奇数阶的正交矩阵，且[tex=2.643x1.357]xnNlsIp2wAAq+OkAnU/oIQ==[/tex]，试证1是[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]的一个特征值

设[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]是一个[tex=0.643x0.786]SBMIs+VUk7//BOpfqlQl0w==[/tex]级正交矩阵，证明：如果[tex=2.643x1.357]xnNlsIp2wAAq+OkAnU/oIQ==[/tex]，且[tex=0.643x0.786]SBMIs+VUk7//BOpfqlQl0w==[/tex]是奇数，那么1是[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]的一个特征值。

设[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]是[tex=2.429x1.071]jLyhB8GAUqIuDKvKM/p5zw==[/tex]矩阵，[tex=3.143x1.357]xnNlsIp2wAAq+OkAnU/oIQ==[/tex]，证明：[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]可以表成[tex=3.929x1.357]oHgxo/VJI2syKm7RzHjvnQ==[/tex]这一类初等矩阵的乘积．

设[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]是实数域上的[tex=0.643x0.786]SBMIs+VUk7//BOpfqlQl0w==[/tex]级矩阵证明：如果[tex=2.643x1.357]xnNlsIp2wAAq+OkAnU/oIQ==[/tex]，且[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]的每一个元素等于它自己的代数余子式，那么[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]是正交矩阵.

设[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]是数域[tex=0.857x1.0]eMszuSG5by5UfRZVROYp5A==[/tex]上的[tex=0.643x0.786]SBMIs+VUk7//BOpfqlQl0w==[/tex]级矩阵[tex=3.214x1.357]iagYNk+QmArrUC5iF4MQ2w==[/tex]证明：如果[tex=2.643x1.357]xnNlsIp2wAAq+OkAnU/oIQ==[/tex]，那么：[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]可以表示成[tex=0.929x1.071]502A3kM9YE+9j/2noEqw2g==[/tex]型初等矩阵[tex=3.929x1.357]oHgxo/VJI2syKm7RzHjvnQ==[/tex]的乘积.

设[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]是数域[tex=0.857x1.0]eMszuSG5by5UfRZVROYp5A==[/tex]上2级矩阵，证明：如果[tex=2.643x1.357]xnNlsIp2wAAq+OkAnU/oIQ==[/tex]，那么[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]可以表示成[tex=0.929x1.286]NUy8JN9WuIhQPFi+yjhSZQ==[/tex]型初等矩阵[tex=3.929x1.357]oHgxo/VJI2syKm7RzHjvnQ==[/tex]的乘积（即[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]可以表示成形如[tex=3.071x1.286]8WQvDCo0GKjvtzeTfrRalQ==[/tex]的矩阵的乘积，其中[tex=2.143x1.214]rP18ZUuz+tEfqGyS7S8Tfg==[/tex]）.

for i in range(b.max_row): for j in range(b.max_column): print(b.cell(row=i,column=j).value)上面语句运行的结果是：__________。 A: 1 1 1 1 1 1 1 1 1 1 B: 1111111111 C: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D: 出现异常

【单选题】CDMA通信的基站,假定基站A的码片序列是+1 +1 +1 -1 -1 +1 -1 -1,基站发射bit为101时,实际发射的信号是 A. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 B. +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 +1 +1 +1 -1 -1 +1 -1 -1 C. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 D. –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1

for i in range(1,11): for j in range(1,11): b.cell(row=i,column=j).value=1 #b是一个工作表对象for i in range(1,11): for j in range(1,11): print(b.cell(row=i,column=j).value,end=" ") print()上面程序代码运行的结果是（）。 A: 1 B: 1 1 1 1 1 1 1 1 1 1 C: 1111111111 D: 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1

下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )