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17.如图,一理想变压器原副线圈的匝数比为1:2;副线圈电路中接有灯泡,灯泡的额定电压为220V,额定功率为22W;原线圈电路中接有电压表和电流表。现闭合开关,灯泡正常发光。若用U和I分别表示此时电压
問題詳情
17.如图,一理想变压器原副线圈的匝数比为1:2;副线圈电路中接有灯泡,灯泡的额定电压为220V,额定功率为22W;原线圈电路中接有电压表和电流表。现闭合开关,灯泡正常发光。若用U和I分别表示此时电压表和电流表的读数,则
(A)
(B)
(C)
(D)
參考答案
答案:A
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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30. ---It’s the office! So you ______ know eating is not allowed here.---Oh, sorry.(A). must (B). wi
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【題組】47. (A). off (B). with (C). after (D). for
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【題組】66. The underlined words “the evicted fish" in Paragraph 3 refer to _____.(A). the fish bea
【題組】39. (A). expected (B). invited (C). allowed (D). chosen
【題組】48. (A). caught (B). searched(C). sought (D). spotted
32. You and I could hardly work together, ______?(A). could you (B). couldn’t I (C). couldn’t we (D)
【題組】58.McKay's flying documents were destroyed in _______.(A). Belgium (B). Germany (C). Canada
【題組】67.The experiment showed that smaller fish ____.(A). fought over a feast (B). went on diet willi
【題組】40. (A). If (B). Since (C). Though (D). When
【題組】49. (A). surprise (B). puzzle (C). story (D). joke
33. Either you or one of your students ______ to attend the meeting that is due tomorrow.(A). are (B
【題組】59. We can learn from the last paragraph that McKay _____.(A). preferred fight to his study(B).
【題組】68. What is the text mainly about?(A). Fish dieting and human dieting.(B). Dieting and health.(C
【題組】41. (A). spirits (B). feelings (C). courage (D). strength
【題組】50. (A). Struggling (B). Trembling(C). Wandering (D). Whispering
【題組】60. What is the text mainly about?(A).The research into war history.(B).The finding of a forgott
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【題組】42. (A). smooth (B). clumsy (C). slow (D). small
【題組】51. (A). got round (B). joined in (C). turned around(D). showed off
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【題組】43. (A). Shouts (B). Laughter(C). Applause (D). Cheers
【題組】52. (A). in (B). out (C). over (D). on