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- 1英语翻译
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- 3如图,在矩形ABCD中,AB=6,AD=8,P是AD上一动点,PE⊥AC于E,PF⊥BD于F,则PE+PF的值为( ) A.5 B.4.8 C.4.4 D.4
- 4He doesn't look a young man in his ______(thirty)
- 5化简(1/2m^4n^3+4m^3n^5-2/3m^3n^2)÷(-1/6m^3n^2)
- 6逆卡诺循环的制冷系数,只与热源与冷源的温度有关?对还是错?
- 7It's good helping blind people to cross the road.
- 8一个等腰三角形画一条线使他有6个角,从中间画线的不算!
- 9关于量和浓度
- 10全概率公式和贝叶斯公式怎么用?