A:至少有一个黒球与都是黒球
B:至少有一个黒球与都是白球
C:恰有个黒球与恰有个黒球
D:至少有一个黒球与至少有个红球
如图所示,MN为凸透镜的主光轴,AB为蜡烛,A′B′为蜡烛所成的像,请用作图法确定凸透镜及一个焦点F的位置,并将它们画出.
下列有关细胞构成生物体的叙述中不正确的是( )
Introduction of a Band
Band name
The new band is called ____.
Country
The band was set up in ____.
Members
There are four people in the band and they are all ____.
Kind of music
More and more people love to listen to their ____.
The reason why people like them
All of their music sounds comfortable and make people ____.
已知线段AB平行于x轴,A的坐标是(﹣2,3),线段AB的长为5,则点B的坐标为____