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(zhǎng)為原來(lái)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
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?lái)的2倍,電路的電阻變?yōu)樵瓉?lái)的二分之一。此電路在1分鐘內(nèi)消耗的電能是()
A.50J B.200J
C.400J D.800J
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
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
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
5. --- How well Susan dances! I can’t believe my eyes.
--- ___________.(09益陽(yáng))
A. So she does B. So does she C. So did she
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
3. --- Our country is becoming richer and stronger.
--- ________. (09綏化)
A.So it is B. So is it C. It is so
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
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
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