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3.將一根電阻絲接在某恒定電壓的電源兩端,電流做功的功率為p。若將該電阻絲均勻地拉長為原來的兩倍后再接入該電源。則它的功率為 [ ]

A. 4p    B.0.25p  C.16p   D.0.125p

試題詳情

2.某電路在1分鐘內(nèi)消耗的電能為100J。若電路兩端的電壓變?yōu)樵瓉淼?倍,電路的電阻變?yōu)樵瓉淼亩种弧4穗娐吩?分鐘內(nèi)消耗的電能是()

A.50J                  B.200J

C.400J                  D.800J

試題詳情

1.把“8V 16W”和“12V 36W”的兩盞電燈、串聯(lián)到電壓是16V的電路中,比較兩盞電燈的實(shí)際功率,則()

A.燈的實(shí)際功率大             B.燈的實(shí)際功率大

C.兩盞電燈的實(shí)際功率一樣大         D.不能確定哪盞電燈的實(shí)際功率大

試題詳情

7. --- After reading the story about Jin Jing, I was very _______.

  --- ________. She’s really brave. (09煙臺(tái))

  A. relaxed, So was I        B. impressing, So did I

  C. impressed, So was I       D. relaxing, So I did

答案:C

試題詳情

6. -My parents never stop going on about (嘮叨) how I should study hard.

-________.(09德州)

A. So my parents do              B. Nor my parents do

C. Nor do my parents             D. So do my parents

答案:C

試題詳情

5. --- How well Susan dances! I can’t believe my eyes.

  --- ___________.(09益陽)

  A. So she does    B. So does she    C. So did she

試題詳情

4. -I hear Yang Yan made an English speech at the graduation ceremony yesterday.

-_______, and _______.(09黃岡)

A. So she did; so did I                B. So did she; so I did     

C. So she was; so I was                  D. So was she; so I was

答案:A

試題詳情

3. --- Our country is becoming richer and stronger.

  --- ________. (09綏化)

  A.So it is   B. So is it   C. It is so

試題詳情

2. -Our country is becoming richer and stronger.

      -_______.(09齊齊哈爾)

A. So it is             B. So is it           C. It is so

試題詳情

1.    --- It’s terribly cold today, isn’t it?

--- Yes. _______ yesterday.(09漳州)

A. So it was   B. So was it   C. So it is   D. So is it

答案:A

試題詳情


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