【简答题】The election of Kennedy as the president of America is not a victory of party but a celebration of_____________.
【单选题】Since he was elected as the president of the student association, many extra responsibilities have been ______ him.
【判断题】3阶正交矩阵的列向量组可以作为【图片】的一组规范正交基
【单选题】The company decided to _______ a Spanish manager as the president of the company.
【判断题】欧式空间 中基向量 通过施密特正交化得到的标准正交基是 。( )
【单选题】(2020吉林东北师大附中高三上模拟)锁钥模型是E.Fischer于1890年提出的,该模型认为:酶和底物在其结合部位的结构应当严格匹配,高度互补,犹如一把锁与其原装钥匙在结构上的互补与匹配,下列有关叙述正确的是( )