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6.下列曲线中离心率为 的是(A). (B). (C). (D).
問題詳情
6.下列曲线中离心率为
的是
(A).
(B).
(C).
(D).
參考答案
答案:B
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
上一篇 :
10.考察正方体6个面的中心,从中任意选3个点连成三角形,再把剩下的3个点也连成三角形,则所得的两个三角形全等的概率等于(A).1(B). 1/2(C). 1/3(D). 0
下一篇 :
【題組】46. (A) events (B) chances (C) feelings (D) moments
資訊推薦
11.若A为不等式组 表示的平面区域,则当a从-2变化到1时,动直线x+y=a扫过A中的那部分区域的面积为;(A).3/4(B).1(C).7/4(D).2
29. You ______ be tired - you've only been working for an hour.(A) must not (B) won' t (C)
7. 直线l过点(-1,2)且与直线垂直,则l的方程是(A).3x+2y-1=0(B). 3x+2y+7=0(C). 2x-3y+5=0(D). 2x-3y+8=0
【題組】47. (A) for no reason (B) from a distance(C) by accident (D) as gifts
【題組】38. (A) Instead (B) Normally (C) Certainly (D) Then
30. I ______ you not to move my dictionary -- now I can' t find it.(A) asked (B) ask (C) was as
22. When flint _______ to the market, these products enjoyed great success.(A) introducing (B) intro
6.函数f(x)=(x-1)2+1,(x≤0)的反函数为:(A). (B). (C). (D).
【題組】48. (A) description (B) pointing (C) scene (D) talk
【題組】39. (A) general (B) deep (C) personal (D) lively
31. If you buy more than ten, they knock 20 pence off ______.(A) a price (B) price (C) the price (D)
7. ,则 中奇数的个数为:(A).2(B).3(C).4(D).5
23. There were dirty marks on her trousers ______ she had wiped her hands.(A) where (B) which (C) wh
【題組】49. (A) Surprisingly (B) Suddenly (C) Expectedly (D) Fortunately
【題組】40. (A) Interested (B) Anxiously (C) Seriously (D) Encouraged
32. — Do you like ______ here?—Oh, yes. The air, the weather, the way of life. Everything is so nice
8.设a<b,函数 的图像可能是(A). (B). (C). (D).
24. The evening news comes on at Seven o' clock and ______ only thirty minutes.(A) keeps (B) co
【題組】41. (A) film (B) story (C) program (D) article
【題組】50. (A) cooking (B) history (C) play (D) medicine
33. I must be getting fat - I can ______ do my trousers up.(A) fairly (B) hardly (C) nearly (D) seld
25.— Has Sam finished his homework today?—I have no idea. He ______ it this morning.(A) did (B) has
【題組】42. (A) a foreign (B) a popular (C) an unusual (D) an unknown
【題組】51. (A) known (B) sent (C) realized (D) ordered
34. According to the art dealer, the painting ______ to go for at least a million dollars.(A) is exp