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• 夜以继日——日理万机　——（　　　　）——（ ）四字成语呀

  1年前

• （2014?广安）如图，矩形ABCD的长为6，宽为3，点O1为矩形的中心，⊙O2的半径为1，O1O2⊥AB于点P，O1O

  1年前

• 设等差数列an的前n项和为sn,已知a6=13,S10=120,设bn=sn/(n+c),且数列bn是等差数列,求非零常

  1年前

• 解不等式|x2-2x+3|＜|3x-1|

  1年前

• 氦气能不能与镁反应

  1年前

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• When the rescue work was broadcast _________, another two villagers were dug out ______from under the earth.

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• lively/lovely/live/living/alive 1．The question set off a ________ discussion．

  1年前

• ①In today’s world many people seem to be hungry for money. Some of them even have lost their lives for it.

  1年前

• “Where is the university（大学）?”This is a question that many visitors to Cambridge(剑桥大学) ask.

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• 已知数列{an}其通项公式为an=2的n次方分之2n-1 求数列的前n项和 Sn

  1年前