A:contribute to solving
B:contribute to solve
C:be contributed to solve
D:be contributed to solving
如图,长方体ABCD﹣A1B1C1D1中,AD=AA1=1,AB=2,点E是线段AB中点.
证明:D1E⊥CE
金鱼缸中的小金鱼口中吐出小气泡,小气泡在升至水面的过程中将会( )
小星带了1000元钱,买了35个同样的网球拍,他可能买了哪种网球拍呢?