A:G1指针向右摆,G2指针向左摆
B:G1指针向左摆,G2指针向右摆
C:两指针都向右摆
D:两指针都向左摆
已知:如图,在四边形ABCD中,对角线AC、BD相交于点O,且AC=BD,E、F分别是AB、CD的中点,EF分别交BD、AC于点G、H.求证:OG=OH.
下列对选文的理解和分析,不正确的一项是( )
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