为n维向量组，且秩()=r, 则( )。\n \n \n \n \n \n \n \n \n \n \n A.\n 任意r个向量线性无关\n
\n \n\n \n \n \n B.\n 任意r+1个向量线性相关\n
\n \n\n \n \n \n C.\n 该向量组存在唯一极大无关组\n
\n \n\n \n \n \n D.\n 该向量组在s＞r时, 由若干个极大无关组\n