–What do you think of the bottled water? --I don’t like it at all. It is reported that much nutrition, including some minerals, _____ while it is being processed.
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nedved720830 春芽
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四边形ABCD中,向量AB=(6,1),向量BC=(x,y),向量CD=(-2,-3),BC‖DA,AC⊥BD,求向量bc坐标.
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