A:铝在地壳中含量比铁高
B:铝的熔点低于铜的熔点
C:空气中铁比铝更容易被腐蚀
D:铝丝在硫酸铜溶液中能形成“铜树”
如图,△ABC中,∠ACB=90°,沿CD折叠△CBD,使点B恰好落在AC边上的点E处,若∠A=25°,则∠BDC等于( )
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