共50条信息
在长方体\(ABCD—A_{1}B_{1}C_{1}D_{1}\)中,对角线\(B_{1}D\)与平面\(A_{1}BC_{1}\)相交于点\(E\),则点\(E\)为\(\triangle A_{1}BC_{1}\)的( )
如下图,\(PA\)是圆\(O\)的切线,切点为\(A,PO\)交圆\(O\)于两点,\(PA=\sqrt{3},PB=1\),则\(AC=\) .
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