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20.如图,一载流长直导线和一矩形导线框固定在同一平面内,线框在长直导线右侧,且其长边与长直导线平行。已知在t=0到t=t1的时间间隔内,直导线中电流i发生某种变化,而线框中感应电流总是沿顺时针方向;
問題詳情
20.如图,一载流长直导线和一矩形导线框固定在同一平面内,线框在长直导线右侧,且其长边与长直导线平行。已知在t=0到t=t1的时间间隔内,直导线中电流i发生某种变化,而线框中感应电流总是沿顺时针方向;线框受到的安培力的合力先水平向左、后水平向右。设电流i正方向与图中箭头方向相同,则i随时间t变化的图线可能是
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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【題組】15. (A)concepts(B)theories(C)divisions(D)conceptions
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【題組】24. Paragraph 5shows that our imitation of behaviors(A) is harmful to our networks of friends(B)
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【題組】33.Paragraph 3 shows that a discovery claim becomes credible after it(A) has attracted the atten
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21.假设地球是一半径为R、质量分布均匀的球体。一矿井深度为d。已知质量分布均匀的球壳对壳内物体的引力为零。矿井底部和地面处的重力加速度大小之比为
【題組】25. The author suggests in the last paragraph that the effect of peer pressure is(A) harmful(B)
【題組】34. Albert Szent-Gy?rgyi would most likely agree that(A) scientific claims will survive challeng
【題組】2. (A)actual(B)common(C)special(D) normal
A deal is a deal-except, apparently ,when Entergy is involved. The company, a major energy supplier
【題組】35.Which of the following would be the best title of the test?(A) Novelty as an Engine of Scient
【題組】3. (A)bore(B)caused(C)removed(D) loaded
If the trade unionist Jimmy Hoffa were alive today, he would probably represent civil servant. When
【題組】4. (A)necessities(B)facilities(C)commodities(D) properties
【題組】5. (A)and(B)nor(C)but(D)hence
【題組】6. (A)for(B)into(C)from(D)against
【題組】15. (A) ruined(B) commuted(C) patrolled(D) gained
【題組】7. (A)meaning(B)implying(C)symbolizing(D)claiming
【題組】16. (A)paralleled(B) counteracted(C) duplicated(D) contradicted
【題組】24. As mentioned in Paragraph 4 a key question unanswered about homework is_____.(A) it should b
【題組】17. (A) neglected(B) avoided(C)emphasized(D) admired
【題組】8. (A)handed out(B)turned over(C)brought back(D)passed down
【題組】34. By saying“Each meeting was packed”(Line 4,Para.6), the author means that______.(A) the supre
【題組】25. A suitable title for this text could be____.(A) wrong Interpretations of an Educational Poli
【題組】9. (A)pushed(B)got(C)made(D)managed
【題組】18. (A) stages(B)illusions(C) fragments(D) advances
【題組】35. Generally speaking, the author’s attitude toward gene patenting is______.(A) critical(B) sup
3.关于植物细胞主动运输方式吸收所需矿质元素离子的叙述,正确的是( )(A)吸收不同矿质元素离子的速率都相同(B)低温不影响矿质元素离子的吸收速率(C)主动运输矿质元素离子的过程只发生在活细胞中(D)