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设双曲线的左右顶点和焦点分别为MNF1F2，，点P在双曲线上，则三角形PF1F2的内切圆与F1F2的切点的位置为什么一定在MN两点
2009-03-12 13:12 来自版块 -
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设双曲线的左右顶点和焦点分别为MNF1F2，，点P在双曲线上，则三角形PF1F2的内切圆与F1F2的切点的位置为什么一定在MN两点
2009-02-11 15:09 来自版块 -
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对于反应物（不考虑固体反应物）不止一种的可逆反应，如N2(g）+3H2(g)==2NH3(g)，平衡时增加N2的浓度，平衡向正向移动，H2的转化率增大，而N2的转化率降低。是为什么啊，H2的转化率增大，这个我知道，就是不知道后面那一句。他的分子和分母不是豆增大了吗，分数值为什么变... 全文
2009-02-10 11:47 来自版块 -
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p2+2pq+q2=1应该怎么解释啊，能具体讲讲吗还有他的运用条件
2009-02-10 11:40 来自版块 -
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With a lot of task_______,he is like a cat on the hot bricks.A to solve B solved Csolving D having solved
2009-02-02 18:13 来自版块 -
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With everything she needed______,she left the market and hurried home to prepare the meal.A to buy B having bought C buying D bought
2009-02-02 18:11 来自版块 -
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ｗｈｉｃｈｅｖｅｒ和ｗｈａｔｅｖｅｒ有什么区别啊或者具体讲讲怎么用吧[ 本帖最后由 YANGXIAOXIN 于 2009-2-2 15:30 编辑 ]
2009-02-02 15:16 来自版块 -
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45. “The interest _________ be divided into five parts, according to the agreement made by both sides,” declared the judge. A. may B.... 全文
2009-02-01 18:16 来自版块 -
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44. I ____ ping-pong quite well, but I haven’t had time to play since the new year. A. will play B. have played C. played D. ... 全文
2009-02-01 18:15 来自版块 -
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43. Hospital staff burst into cheers after doctors completed a 20-hours operation to have ______ one-year-old twins at the head. A. isola... 全文
2009-02-01 17:27 来自版块 -
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42. We didn’t plan our art exhibition like that but it ____ very well. A. worked out B. tried out C. went on D. carried on选... 全文
2009-02-01 17:25 来自版块 -
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41. Happy birthday, Alice! So you have ___________ twenty-one already! A. become B. turned C. grown D. passed
2009-02-01 17:23 来自版块 -
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40. —How about eight o’ clock outside the cinema? —That _______ me fine. A. fits B. meets C. satisfies D. suits选B 不行吗，答案选D
2009-02-01 17:22 来自版块 -
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39. He paid for a seat, when he ______ have entered free. A. could B. would C. must D. need
2009-02-01 17:21 来自版块 -
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35. ____ modeling business is by no means easy to get into, the good model will always be in demand. A. While B. Since C. As ... 全文
2009-02-01 17:20 来自版块 -
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34. The home improvements have taken what little there is ____ my spare time. A. from B. in C. of 什么意思啊
2009-02-01 17:19 来自版块 -
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22. —Which of the two ties would you like to take? —I’d like to take ________, to give me a change sometimes. A. both B. each ... 全文
2009-02-01 17:17 来自版块 -
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10. The poor young man is ready to accept _____ help he can get. A. whichever B. however C. whatever D. whenever
2009-02-01 17:16 来自版块 -
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7. —Don’t you think it necessary that he ____ to Miami but to New York？ —I agree, but the problem is __ he has refused to. A. will not b... 全文
2009-02-01 17:15 来自版块 -
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2. My ___ of this weekend’s activity is going out with some good friends. A. idea B. opinion C. mind D. thought
2009-02-01 17:15 来自版块 -
