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如图所示,已知四边形ABCD的对角线AC、BD相交于点O,则下列能判断它是正方形的条件是( )
若手指划破后感染发炎,血检时往往会发现血液中哪一种成分增多( )
The teacher took my hand in h____ and said “keep on going never give up” .