电解水的实验装置如图所示,根据图回答:
如图,已知抛物线y=ax2+ 85 x+c与x轴交于A,B两点,与y轴交于丁C,且A(2,0),C(0,﹣4),直线l:y=﹣ 12 x﹣4与x轴交于点D,点P是抛物线y=ax2+ 85 x+c上的一动点,过点P作PE⊥x轴,垂足为E,交直线l于点F.
When the meeting was ________, they all ________ to their feet and left.