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Simon failed the exam again. Because computer games ________ too much of his time.
1年前
已知:如图,在ΔABC中,BD、CE分别平分∠ABC、∠ACB,且BD、CE交于点O,过O作OP⊥BC于P,OM⊥AB于M,ON⊥AC于N,则OP、OM、ON的大小关系为____________.
1年前
粗食盐中除含有钙、镁、硫酸根等可溶性杂质外,还含有泥砂等不溶性杂质. 实验室中粗食盐提纯的操作如下:
1年前
若(x+y)除以z=(y+z)除以x=(x+z)除以y=k,求k
1年前
Young men were once required to be ________ (教育) in good manners.
1年前