一个同时提供坐标和加减控制的鼠绘~感觉非常舒服-provide coordinates of a modified control and mouse drawn to feel very comfortable

N沟道增强型MOS管的结构，PN结的单向导电性，PN结的形成，基本放大电路的放大作用-N-channel enhancement mode structure of MOS tube, unilateral electrical conductivity of the PN junction, the formation of the PN junction, the basic amplifying circuit amplification effect