向量组的秩是 ( ).
B
暂无解析
Postage ______, the necklace will cost you at least 650 yuan.
设 A,B 都是 n 阶矩阵 (n>1) ,则下列命题正确的是( ).
ManyworkerswereorganizedtoclearawayremainedoftheWorldTradeCenter.
Under no circumstance _____ to tell lies to parents.
下面各句中,加点成语使用恰当的是。