题目

 直线过抛物线的焦点且与抛物线交于A，B 两点，若，则线段AB长等于   ▲  [来源:学_科_网] 答案： 8 It was in the lab _____ was taken charge by Professor Wang ______ they did the experiment.A．where, thatB．that, whichC．that, whereD．which, that