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- 1已知全集U=R,集合A={x|x小于等于a-1},集合B={x|x大于a+2},.
- 2请问物种丰富度的具体定义是什么?
- 3It was very cold yesterday(改为感叹句) ___cold___it was yesterday
- 4大正方体棱长是小正方体棱长的2倍,大正方体的体积比小正方体的体积多56立方分米,
- 5王师傅加工3个零件用40分钟,李师傅加工4个零件用了30分钟,王师傅和李师傅加工零件的比是?
- 6-4a^3b^2+8a^2b-4a 因式分解
- 7doesn't like 后面是不是跟动词原形?
- 8甲,乙两人相距42千米,若相向而行,2小时相遇;若同向而行,乙要14小时才能追上甲.则甲,乙二人每小时各走( )千米. A.12,9 B.11,10 C.10,11 D.9,12
- 9有若干个数,第一个数记为a1,第二个数记为a2,第三个数记为a3,...第n个数记为an,若a1=负二分之一
- 10It is____ work of art that everyone wants to have a look at it.A a so unus