A:I have an English book and three notebooks.
B:I have three English books and a notebook.
下列叙述正确的是()
— is your father?
—He is in the kitchen.
如图,将平行四边形ABCD的边AB延长至点E,使BE=AB,连接DE,EC,DE,交BC于点O.
在实验中通过电路中灯泡的明亮程度来判断电路中电流的大小,这是利用了( )