We eat food with the help of hands every day. It is possible for some germs(细菌) to get into our bodies. So it is important to know how to wash hands in the right way.

    A piece of news from CCTV says that students from Guangzhou have a good way of learning how to wash hands. They learn it through doing hands-washing exercises during the ①break. The teachers there say most students wouldn't like to listen but they like to act. So now the students are interested in the interesting exercises. They are learning carefully. ②They want to be teachers for their parents and friends after they learn them well.

下列各式中,与x²y是同类项的是(　)

如图，A、C两点分别位于x轴和y轴上，∠OCA=30°，OC的长度为L．在△OCA区域内有垂直于xOy平面向里的匀强磁场，磁感应强度为B．质量为m、电荷量为q的带负电粒子，从坐标原点射入磁场．不计重力．

函数$f\left(x\right)=a^x-\left|{\log }_{a}x\right|(a>0,a\ne 1)$的零点个数  (  )