A
A.向量组(alpha_{1},alpha_{2},cdots,alpha_{s}与向量组beta_{1},beta_{2},cdots,beta_{t}等价)
B
B.(R(alpha_{1},alpha_{2},cdots,alpha_{s},beta_{1},beta_{2},cdots,beta_{t})=r)
C
C.当(alpha_{1},alpha_{2},cdots,alpha_{s}可由beta_{1},beta_{2},cdots,beta_{t}线性表示时,beta_{1},beta_{2},cdots,beta_{t}也可由alpha_{1},alpha_{2},cdots,alpha_{s}线性表示)
D
D.当(s=t)时,向量组(alpha_{1},alpha_{2},cdots,alpha_{s}与向量组beta_{1},beta_{2},cdots,beta_{t}等价)