杠杆 物理 方示长棒撬石头,从图上可分析出 点,动力管,阻力臂。下方示拍水机的房 支点。动力、动力作用点,阻力 就是一根杠杆 what are you going to study I am going to study Physics
——What are you going to study ？ ——I am going to study . Physics
他学 NAVis What are you going to study I am going to study Chemistry
—What are you going to study ? —I am going to study Chemistry
D}迈历史。 历史上重 what are you going to study -I am going to study history
——What are you going to study ? —— I am going to . study History
What are you going to study I am going to study Geography Id3r'pgrofr
——What are you going to study ? —— I am going to study Geography. [dʒɪ'ɒgrəfɪ]