问题
填空题
电流与磁场的方向（）时的作用力最大，（）时的作用力为零。
答案
参考答案：垂直；平行
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电流与磁场的方向（）时的作用力最大，（）时的作用力为零。
参考答案：垂直；平行
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The boy was trying to reach a doorbell which was too high for him. He was a 2._________ man, so he stopped and said, " I will ring the bell for you." and then he pulled the bell so hard that it could be 3._________over the house. The little boy looked up at him and said, "Now we must run away. Come on." And before the old gentleman knew what was 4._________, the boy ran round the corner of the street, leaving the old man of explaining to the angry owner of the house 5._________ he had rung the bell. |