A:{2}
B:{2,3}
C:{1,,3 }
D:{1,2,3,4,5}
已知抛物线x2=2py(p>0)的焦点为F,直线x=4与x轴的交点为P,与抛物线的交点为Q,且 |QF|=54|PQ| .
The encyclopedia ________ eight units and many different topics.