【单选题】已知 x=-2 y=4 和 x=4 y=1 都是方程y=ax+b的解,则a和b的值是( )
【单选题】______ is the best name and description of the vessel referred to.
【简答题】听短文,填空。 Information Sheet 1 Lin Yu comes from _________ in Shanghai. 2 Lin Yu has such an English name because her mother thought she was _________ an angel. 3 Lin Yu is a little girl and doesn't look...
【单选题】已知 a =(3,4), b =(5,12), a 与 b 的夹角的余弦为( )
【单选题】一个算法应该具有“确定性”等5个特性,下面对另外4个特性的描述种错误的是