问题
选择题
某同学在做伏安法测电阻的实验时连接的电路如图所示.闭合开关后.发现电压表指针有明显的偏转而电流表的指针几乎不动.调节滑动变阻器的滑片时，电压表的指针没有明显的变化. 产生这种现象的原因可能是
A.电流表内部发生短路现象
B. 电流表内部发生断路现象
C. 滑动变阻器发生短路现象
D. 待测电阻发生断路现象
答案
答案：D
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某同学在做伏安法测电阻的实验时连接的电路如图所示.闭合开关后.发现电压表指针有明显的偏转而电流表的指针几乎不动.调节滑动变阻器的滑片时，电压表的指针没有明显的变化. 产生这种现象的原因可能是
A.电流表内部发生短路现象
B. 电流表内部发生断路现象
C. 滑动变阻器发生短路现象
D. 待测电阻发生断路现象
答案：D
选词填空 用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。
Hearing the young man’s words, the old couple 小题4:very disappointed, and turned around to leave. Just as they were leaving, the young man came up to them and stopped them: “Madam and sir, if you don’t mind, you can sleep in my bedroom小题5:a night……. ” The next evening, the old couple took out 小题6:of money to give it to the young man, but he refused to take it. “No！You needn’t pay me 小题7:money, for I only lend my room to you. ” said the young man with a smile on his face. “You’re great, young man! It’s very 小题8:of you. Maybe one day, I’ll build a hotel for you!” said the old man 小题9: . With 小题10: words, the old couple left. |