平行板间加如图所示周期变化的电压，重力不计的带电粒子静止在平

平行板间加如图所示周期变化的电压，重力不计的带电粒子静止在平行板中央，从t=0时刻开始将其释放，运动过程无碰板情况，能定性描述粒子运动的速度图象正确的是 ( )

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平行板间加如图所示周期变化的电压，重力不计的带电粒子静止在平

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