题目

Cloud 9 Bar      Do you want to enjoy a cocktail at one of the highest bar in Asia? If so, you can come to the 87th floor of the Jin Mao Tower. Here you'll find Cloud 9, the Grand Hyatt Hotel's bar. You can enjoy the delicious beef and the beautiful light music. It is a quiet place here.      Add: 87F Jin Mao Building, 88 Shi Ji Street, Putong      Lowest Cost: ￥ 88/person      Beer: ￥ 50/bottle      Time: Mon.--Sat. : 11:30 am--2am      Tel: 021 - 50471234                                                        已知A、B为抛物线y2=2px(p>0)上两点,O为原点,若|OA|=|OB|,且△AOB的垂心恰是此抛物线的焦点,则直线AB的方程是(    )A.x="p         " B.x="3p          " C.x=p             D.x=p