—I think it was not good.It was a(n) performance.
A:wonderful
B:lifeless
C:interesting
如图所示,质量为m的小球(可视为质点)用长为L的细线悬挂于O点,自由静止在A位置.现用水平力F缓慢地将小球从A拉到B位置而静止,细线与竖直方向夹角为θ=60°,此时细线的拉力为T1,然后撤去水平力F,小球从B返回到A点时细线的拉力为T2,则( )
①10﹣3=0.0001; ②(0.0001)0=1; ③3a﹣2= 13a2 ; ④(﹣2)3÷(﹣2)5=﹣2﹣2.