A:We went to the Tianchi Lake last June.
B:We went to the Tianchi Lake last July.
如图所示,点B、E分别在AC、DF上,BD、CE均与AF相交,∠1=∠2,∠C=∠D,求证:∠A=∠F.
面包发霉是因为在它的上面生长了一种生物叫____。
输卵管结扎以后人体表现为( )