如图所示，M、N两金属圆筒是直线加速器的一部分
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如图所示，M、N两金属圆筒是直线加速器的一部分，M与N的电势差为U;边长为2L的立方体区域，内有竖直向上的匀强磁场。一质量为m，电量为+q的粒子，以初速度v0水平进入圆筒M左侧的小孔。粒子在每个筒内均做匀速直线运动，在两筒间做匀加速直线运动。粒子自圆筒N出来后，从正方形，的中心垂直进入磁场区域，最后由正方形，中心垂直飞出磁场区域，忽略粒子受到的重力。求：，
(1)粒子进入磁场区域时速率;
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so much \so many \suchmuch\such\many的区别和用法so many和such many 都加形容词时，有什么区别吗
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