—What have you got, May?—
A:May has got a panda.
B:I have a got a panda.
小军手里有一个额定电压为6V,正常工作电流约为0.5A的小灯泡,他想利用小灯泡探究“电流和电压的关系”,电源电压为9V.
平行四边形可画出两条对称轴