How many sheep?
A:This is a sheep.
B:Six sheep.
No way! I don't think should be allowed to drive. I am worried about your safety.
植物体的整个生命历程中,植物激素起到了关键作用,以下说法正确的是( )
如图,把螺线管沿东西方向水平悬挂起来,然后给导线通电,会发生的现象是( )