题目

       Jeffery Deaver looks more like a brainy villain （反派人物） in a James Bond movie than a 00 agent in Her Majesty's secret service．Best known for his thrillers starring criminalist （刑事专家） Lincoln Rhyme, Jeffery Deaver has a new mission: Bring Bond into the 21st century in a new 007 novel．        The yet-to-be-named book is cryptically （隐秘地） referred to as Project X by Ian Fleming Publications Ltd．which owns the rights to Fleming's work．Most of the details surrounding Project X, to be published in May, are being kept under wraps, but under 如图所示，已知F1=20N，F2=50N，试用作图法求出合力．