【简答题】The chief disadvantage of pronouncing words while you read them is that it tends to tie reading speed to speaking speed, and the silent reading of most normal readers is nearly ______ as fast as their...
【简答题】如图甲所示,在竖直方向上有四条间距相等的水平虚线 L 1 、 L 2 、 L 3 、 L 4 ,在 L 1 L 2 之间、 L 3 L 4 之间存在匀强磁场,大小均为 1 T ,方向垂直于虚线所在平面.现有一矩形线圈 abcd ,宽度 cd = L = 0.5 m ,质量为 0.1 kg ,电阻为 2 Ω ,将其从图示位置静止释放 ( cd 边与 L 1 重合 ) ,速度随时间的变化关系如图乙所示...