题目内容：
He was running（ ）the pace he had learnt from the natives.
at
答案解析：
选择题：He was running（ ）the pace he had learnt from the natives.at
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- 题目类型：选择题
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He failed to carry out some of the provisions of the contract,and now he has to
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A good citizen is expected to conform（ ）the law of his country.to
A good citizen is expected to conform（ ）the law of his country.to
设A为3阶矩阵，α1，α2，α3为线性无关的向量组。若Aα1＝α1＋α2，Aα2＝α2＋α3，Aα3＝α1＋α3，则|A|＝
设A为3阶矩阵，α1，α2，α3为线性无关的向量组。若Aα1＝α1＋α2，Aα2＝α2＋α3，Aα3＝α1＋α3，则|A|＝
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设有位于曲线下方，x轴上方的无界区域G，则G绕x轴旋转一周所形成空间区域的体积为
试求一个正交的相似变换矩阵, 化为对角阵
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