一、示波器图1是示波器的原理图,电子经电压为U1的加速电场加速后射入电压为U2的偏转电场,离开偏转电场后电子打在荧光屏上的P点,P点与O点的距离叫做偏转距离.单位偏转电压引起的偏转距离称为示波器的灵敏度.例1欲提高示波器的灵敏度,应采取下列哪些方法?()A.提高加速电压U1B. First, the oscilloscope Figure 1 is the schematic diagram of the oscilloscope, the electrons are accelerated by the accelerating electric field of U1 and then injected into the deflecting electric field with voltage U2, and after leaving the deflecting electric field, the electrons hit the P point on the fluorescent screen, the distance between P point and O point. This is called the deflection distance. The deflection distance caused by the unit deflection voltage is called the sensitivity of the oscilloscope. Example 1 To increase the sensitivity of the oscilloscope, which of the following methods should be taken? () A. Increase the acceleration voltage U1B.