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问题1如图1,在抛物线y~2=2px中,直线AB过焦点F,B在准线l上的射影为B_1,则直线AB_1是否过定点O(0,0)?
Problem 1 As shown in Fig. 1, in the parabola y~2=2px, the straight line AB passes through the focal point F, and the projection of B on the direct line l is B_1. Is the straight line AB_1 over the fixed point O(0, 0)?