A. 存在一组不全为零的数k1，k2，…，ks使等式β=k1α1+k2α2+…+ksαs成立
B. 存在一组全为零的数k1，k2，…，ks，使等式β=k1α1+k2α2+…+ksαs，成立
C. 存在一组数k1，k2，…，ks，使等式β=k1α1+k2α2+…+ksαs，成立
D. 对β的线性表达式唯一
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