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在空间四边形ABCD的各边AB,BC,CD,DA上依次取点E,F,G,H,若EH、FG所在直线相交于点P,则( )
1年前
如图,E,F分别是边长为6的正方形ABCD的边CD,AD上两点,且CE=DF,连接CF,BE交于点M
1年前
Sixteen years ago a boy gave me an important gift. It was a smile.
1年前
I wonder how many ______ (手术) ORBIS doctors perform during their visit to a poor country.
1年前
如果不等式4x-3a>-1与不等式2(x-1)+3>5的解集相同,请确定a的值.
1年前