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- 1某有机物CnHmO2 1mol在氧气中充分燃烧
- 2I want to go ---------(shop) with my mother.(填入词的正确形式)
- 3Lily comes fromamercia.She lives in china a--,but she has many friends here
- 4已知圆(x-2)^2+y^2=9与直线y=kx交与A,B两点,O是坐标原点.若向量OA+2向量OB=向量0,则|AB|=
- 5The poor man was made () in the fields.A.to work B.work C.working D.worked
- 6同学们排成一排做操,排在小明前面的同学占这排人数的五分之三,排在小名后面的同学占这排人数的三分之一.
- 7科学的名人名言
- 8如图所示,在△ABC中,∠B=90°,AB=3,AC=5,将△ABC折叠,使点C与点A重合,折痕为DE,则△ABE的周长为_.
- 9金刚石是正四面体结构还是正八面体结构?
- 10什么是质量作用定律