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- 2China is a big country.The weather in the south is quite different from in the north .Shanghai is a beautiful city of Ch
- 3我们正要离开,天下起了大雨.We were just about to leave when it began to rain.还是用we were leaving
- 4已知一个H2O的质量是b克,NA表示阿伏伽德罗常数,则M(H2O)等于多少g/摩尔?
- 53×(9的N次方减一)等于M×(3的2N次方减3)求M的值
- 624分之16等于( )除以8等于多少分之8等于48除以( )等于几分之几写最简分数
- 7若x^2+y^2+4x-8y+20=0,求分式x^2-y^2/xy的值
- 8求优美的词语和优美的句子.(句子最好在20字左右)
- 9运用经济生活知识,探究引起我国汽车价格不断下跌的原因
- 10在Rt△ABC中,∠ACB=90°,AC=CB,CD是斜边AB的中线,若AB=2根号2,则点D到BC的距离为