题目内容：
They sell the sweater（ ）a discount of 30 percent.
at
答案解析：
选择题：They sell the sweater（ ）a discount of 30 percent.at
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- 题目类型：选择题
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People who refuse to comply（ ）the law will be punished.with
People who refuse to comply（ ）the law will be punished.with
If you really understood the difficulties facing the government,you wouldn’t be
If you really understood the difficulties facing the government,you wouldn’t be so critical（ ）its sp
If you persist（ ）causing troubles,the company will have to dismiss you.in
If you persist（ ）causing troubles,the company will have to dismiss you.in
设E为三阶单位矩阵。（Ⅰ）求方程组AX＝0的一个基础解系；（Ⅱ）求满足AB＝E的所有矩阵。
设E为三阶单位矩阵。（Ⅰ）求方程组AX＝0的一个基础解系；（Ⅱ）求满足AB＝E的所有矩阵。
施密特法把向量组正交化
施密特法把向量组正交化