题目

Which word has the different stressed syllable from the others?          A. Connect                  B. Culture         C. Expert 答案：A1．作图题．（1）汽车刹车原理图如图所示，连着刹车踏板的金属杆是一根能绕O点转动的杠杆，当驾驶员踩下刹车踏板时，刹车油受到挤压从而推动活塞向左移，活塞挤压刹车卡钳夹紧刹车盘产生摩擦力使车辆减速，请在图中作出踩下刹车踏板时力F的力臂L．