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问题 实验题

小阳在探究电路中电压关系时，得到了一组实验数据如下表所示，请根据实验数据写出电压U2和U1的关系式：U2＝               。（2分）

答案

U2＝9V－U1 

题目分析：观察表中数据可知，U2和U1的和是定值9V，所以U2和U1的关系式为U2＝9V－U1

选择题

下列物质长期放置在敞口容器中，质量明显减少的是（　　）

A．大理石

B．氢氧化钠固体

C．浓盐酸

D．氯化钠固体
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填空题

Questions 9-13


·You will hear five people talking about "Whether They Write for Themselves or for Their Readers ".
·For questions 9 to 13, choose from the list A to F what each speaker says.
·Use the letters only once. There is one extra letters which you do not need to use.
  • A. It all depends on the type of writing.
  • B. I always write for myself and never care about the readers.
  • C. I definitely write for myself but I try not to cause unnecessary offences.
  • D. I actually write both for myself and for my readers.
  • E. I have no idea at all for whom I write.
  • F. I write mostly for myself and hope for any readership.
    Speaker 1 (/9 )
    Speaker 2 (/10 )
    Speaker 3 (/11 )
    Speaker 4 (/12 )
    Speaker 5 (/13 )
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