In his victory speech,______ before a huge crowd of his supporters,Obama declared that “change has come to America”.
A:having delivered
B:to be delivered
C:delivering
D:delivered
如图是一个空间几何体的三视图,则该几何体的全面积为( )
若关于x,y的二元一次方程组x+y=k2x-y=8k的解也是二元一次方程3x+2y=10的解,则k的值为( )
读漫画“长江与黄河的对话”,下列叙述正确的是( )
公元前8世纪,形成于小亚细亚西海岸和希腊各地的以城市为中心的小国,历史上称为( )