已知二次函数y=mx2-7x-7的图象和x轴有交点,则m的取值范围是( )
当0<a<1时,在同一坐标系中,函数y=ax与y=logax的图象是( )
如图,课外探究小组的同学,把一条大约10m长电线的两端连在一个灵敏电流表的两个接线柱上,形成闭合回路.两个同学迅速摇动这条电线,可以发电使电流表发生偏转.你认为这两个同学朝哪个方向站立时,发电的可能性比较大?( )
A. At eleven o'clock.
B. I don't think so.
C. I'm going to swim with Tim.
D. It's five o'clock.
E. He is going to take pictures.