题干

如图是“测量小灯泡的额定功率”的实验电路图.在这个实验的具体操作中,手和眼睛最合理的分工应该是(  )

A:手移动变阻器的滑片,眼睛观察变阻器的滑片的位置

B:手移动变阻器的滑片,眼睛观察小灯泡是否发光

C:手移动变阻器的滑片,眼睛观察电压表的示数

D:手移动变阻器的滑片,眼睛观察电流表的示数

上一题 下一题 0.0难度 选择题 更新时间:2016-07-19 02:22:02

答案(点此获取答案解析)

C

同类题4

阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑

    A man worked in a post office. His job was to handle(处理) all 1 that had unclear addresses. One day he came across a letter which was 2to God. He opened it and it 3,“Dear God,I am an 83­year­old woman and I live on a very small pension(养老金).Yesterday someone stole my 4.There was a hundred dollars in it,which was all the money I had 5 until my next pension comes. Next Thursday is Thanksgiving Day,and I have invited my last two friends for 6.Without that money,I have 7 to buy food with. I have no family to 8,and you are my only 9.Can you please help me?” The man was 10,and went around showing the letter to all the other workers. Each of them 11 their wallets and donated a few dollars. By the time he 12 his showing,he had collected 96 dollars. 13then he sent it to the old woman. Thanksgiving Day came and went. The workers 14forgot about it. Then one day,there came another letter from the old lady to God.All the 15gathered around when the letter was16.It read,“Dear God,how can I ever thank you enough for what you did for me?Because of your kindness,I was able to 17 a lovely dinner for my friends. We had a very 18 day,and I told my friends about your19 gift. Thank you very much!” Seeing this,all the workers felt 20 with the nice thing they had done. They looked into each other's eyes and smiled.