如图是一个示波管工作原理图的一部分，电子经过加速后以速度v0

如图是一个示波管工作原理图的一部分，电子经过加速后以速度v₀垂直进入偏转电场，离开偏转电场时的偏转量为y，两平行板间距为d、板长为L、板间电压为U．每单位电压引起的偏转量（y/U）叫做示波管的灵敏度，为了提高灵敏度，可以采用的方法是（）

A．增加两板间的电势差U	B．尽可能缩短板长L
C．尽可能减小板距d	D．使电子的入射速度v₀大些

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