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- 1在实验室里,常用亚硫酸钠跟浓硫酸起反应制取二氧化硫
- 2This is a photo of my family
- 3x+y=0;x的2次方-xy+y的2次方=3
- 4甲乙两个仓库总数是80吨,其中甲仓库的三分之一与乙仓库的四分之一相等,两个仓库各存粮多少吨?
- 5若函数f(x)=(a^2+4a减5)x^2减4(a减1)x+3的图像都在x轴上方,求实数a的范围?
- 6为什么人造卫星绕地球做椭圆运动机械能守恒,不要说动能转化为重力势能,相互转化,所以守恒,那为什么相互转化,转化的前提是机械能守恒啊,那位什么机械能守恒呢?
- 7已知偶函数f(x)在区间(0,正无穷大)上单调递增,则满足f(2x-1)小于f(1/3)的x的取值范围是?
- 8Tom does not like the film__,but his parents like__(himself,itself)
- 9You can not talk with the baby.He is only 7 mouths old.He can not s____ yet
- 10What do you do on the weekends?_______________________________________________.