某实验小组研究一白炽灯两端电压与电流的关系，得到了一组数据，并描绘出其I-U图线

发布时间：2017-05-18 09:42 │ 来源：www.tikuol.com

题型：实验题

问题：

某实验小组研究一白炽灯两端电压与电流的关系，得到了一组数据，并描绘出其I-U图线如图中（a）所示。

①由图线可看出该白炽灯的电阻随电压的增大而________（选填“增大”或“减小”）

②实验还用到了下列器材：直流电源、滑动变阻器、电压表、电流表、开关及导线若干。请在图（b）中以笔划线代替导线按实验要求将实物图补充完整。

考点：实验：伏安法测电阻实验：练习使用示波器实验：测绘小灯泡的伏安特性曲线实验：探究影响导体电阻的因素

题型：实验题

完形填空。

      A 14-year-old boy from the USA was described as a hero yesterday after he saved the life of a woman
in another country.
      Dean Bluey from Dallas, Texas, was a school boy who has much    1   in computer. One day, he    2
an email to a friend on the Internet. Suddenly he received a message saying "Help! Pain! Help" The message
was from Finland.    3   kilometers away from America.
      "I didn't know    4   I should do," Dean said to a reporter afterwards. "It was really difficult to tell if
the message was real." So Dean did nothing at first.    5   the message kept coming.
      "By then it was easy to see that someone was in trouble," Dean explained. He    6   and discovered that
the sender was a student called Tarja, who was alone in a university library. She was ill. What was    7   ,
there was no phone around her. Her only way of communicating with the world was by email. Dean got
in touch    8   the police immediately. And they realized that the situation was quite serious. They called
the police in Finland. Then an ambulance rushed to the library.    9   , she was still alive and was sent to
the hospital quickly. "I'm glad she's OK," Dear, said. "It's hard to believe,    10   saved her life."

( )1. A.interest
( )2. A.sent
( )3. A.thousand
( )4. A.how
( )5. A.So
( )6. A.telephoned
( )7. A.better
( )8. A.with
( )9. A.Hardly
( )10. A.a boy

B.interested
B.sends
B.thousandc
B.what
B.And
B.replied
B.worse
B.on
B.Happily
B.doctors

C.interesting
C.was sending
C.thousands
C.where
C.But
C.found
C.harder
C.to
C.Luckily
C.the police

D.interests
D.is sending
D.thousands of
D.when
D.As
D.talked
D.easier
D.at
D.Carefully
D.email

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题型：实验题

预防过敏性哮喘发作的平喘药是

A．沙丁胺醇

B．特布他林

C．色甘酸钠

D．氨茶碱

E．异丙肾上腺素

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题型：实验题

密码器状态停用客户身份验证方式（）

A.出示

B.出示核查

C.出示核查留存

D.不出示

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题型：实验题

磨床工作台液压缸的移动方向与机床导轨面，其平行度允差不得超过（）mm。

A.0.05

B.0.07

C.0.1

D.0.2

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题型：实验题

环管反应器内淤浆浓度约为（）左右。

A、30-40%

B、50-60%

C、60-70%

D、70-80%

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