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9.5.5在用键盘控制节点对小车进行控制的过程中,为什么小车只能接收到第一条方向信息,接收到第一条方向信息(比如说I键)之后,再按其他方向的按键(比如说O键)给小车其他方向的信息,小车无反应,而且按K键小车不停止。而且也不能降低小车的轮子速度。