【判断题】设 A 是 m ́n 矩阵,齐次线性方程组 Ax = 0 有非零解,其基础解系中有r个向量,则R(A) = n-r。
【单选题】可使针感向一定方向传导的行针辅助手法的是
【单选题】The impact of Jack Lindsay's ideological attitudes on his literary success was
C.
limited but indivisible.
D.
obscure in net effect.
【单选题】可使针感向一定方向传导的行针辅助手法是()。
【单选题】先张法施工中,张拉后的预应力筋与设计位置的偏差不得大于( )
【单选题】先张法预应力施工中,先张法预应力筋张拉后与设计位置的偏差不得大于( )mm,且不得大于构件界面短边边长的4%。
【单选题】According to the passage, Lindsay's purpose in life was to______.
A.
become a famous lawyer
C.
get another scholarship to study abroad
D.
be elected to political office at the local level
【单选题】According to the passage, Lindsay's purpose in life was to _________.
A.
become a famous lawyer
B.
be elected to political office at the local level
C.
get another scholarship to study abroad
【判断题】设 A 是 m ́n 矩阵,且 R(A) = r < n,则,齐次线性方程组 Ax=O 存在基础解系,且基础解系中有 n-r 个线性无关的解向量.