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3.在图2中,AB间的电压力30V,改变滑动变阻器触头的位置,可以改变CD间的电压,UCD的变化范围是 [ ]

 A.0-10V                 B.0-20V

 C.10V-20V                 D.20V-30V

试题详情

1.电阻R1、R2、R3串联在电路中。已知R1=10Ω、R3=5Ω,R1两端的电压为6V,R2两端的电压为12V,则 [ ]

 A.电路中的电流为0.6A         B.电阻R2的阻值为20Ω

 C.三只电阻两端的总电压为21V      D.电阻R3消耗的电功率为3.6W

 2.如图1所示,电源和电压表都是好的,当滑片由a滑到b的过程中,电压表的示数都为U,下列判断正确的是 [ ]

 A.a处接线断开                B.触头P开路

 C.a、b间电阻丝开路             D.b处接线开路

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93. –Who taught you to play volleyball?

  --Nobody, I learnt it by ______. (09随州)

  A. me    B. my    C. myself

答案:C

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92. –What are you doing this weekend?

  --I want to do _______. (09贵港)

  A. something different     B. different something

  C. anything different      D. different anything

答案:A

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91. Friends like you make _____ a lot easier to get along in a new place. (09枣庄)

  A. me    B. that    C. you    D. it

答案:D

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90. –Excuse me. Is this ______ book, Kangkang?

  --No, it’s not ______. (09益阳)

  A. yours, mine   B. your, mine   C. your, my

答案:B

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89. –What do you think of the street?

  --Very beautiful. There are many tall trees on ______ side of it. (09益阳)

  A. either   B. both    C. every

答案:A

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88. –Is this the Greens’ house?

  --No. _______ is over there. (09 威海)

  A. His    B. Their    C. Theirs    D. Them

答案:C

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87. The doctor advised Elsa strongly that she should take a good rest, but ____ didn’t help. (09南京)

  A. she   B. it   C. which   D. he

答案:B

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86. –Are the keys over there ______?

  --No. Go and ask Anna. They may belong to her. (09南京)

  A. you   B. your   C. yours   D. yourself

答案:C

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