选择题:( )I believed his wife ____for him just as I was p 题目分类:河南工业大学-材料科学与工程-大学英语(二) 题目类型:选择题 查看权限:VIP 题目内容: ( )I believed his wife ____for him just as I was praying for James.(本题1.5分) A、 should be praying B、 must be praying C、 would D、 must pray 参考答案:
如果方程{3x1+kx2-x3=0,4x2-x3=0,4x2+kx3=0有非零解,则k=() A.- 如果方程{3x1+kx2-x3=0,4x2-x3=0,4x2+kx3=0有非零解,则k=() A.-2 B.-1 C.1 D.2 分类:河南工业大学-材料科学与工程-大学英语(二) 题型:选择题 查看答案
设a1,a2,a3,a4是一个4维向量组,若已知a4可以表为a1,a2,a3的线性组合,且表示法惟一 设a1,a2,a3,a4是一个4维向量组,若已知a4可以表为a1,a2,a3的线性组合,且表示法惟一,则向量组a1,a2,a3,a4的秩为() A.1 B.2 分类:河南工业大学-材料科学与工程-大学英语(二) 题型:选择题 查看答案