ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.力学实验专题 一、常见仪器的使用与读数 例 1.如图所示,物体 A 的长度为 _____cm,弹簧测力计 的示数为 N。二、一些基本实验例 2、小明在探究“杠杆的平衡条件”实验中, ( 1 ) 实 验 前 他 应 先 调 节 杠 杆 在 水 平 位 置 平 衡 , 其 目 的 是 . (2)杠杆平衡后,小明在图甲所示的 A 位置挂上两个钩码,可在 B 位置挂上 个钩码,使杠杆在水平位置平衡. (3)他改用弹簧测力计在图乙所示的 C 位置斜向下拉,若每个钩码重1N.当杠杆在水平位置平衡时,测力 计的 示数将 (选填“大于”、“等于”或“小于”)1N. 例 3、如图所示,是探究“动能的大小与哪些因素有关”的实验: (1)用质量不同的 A、B 两个小球(mA>mB)碰撞静止在同一水平面上的纸盒.实验中控制小球的高度相同,是为了控制两球到达底端时__________相同;实验中通过观察纸盒被推动的距离的大小,可以比较 A、B 两个小球的_____ 的大小。 Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the league members. All League branches should start with recommending outstanding students as the development objects of the League, take amateur league schools as the basis, conscientiously do a good job in the work of pre-league education, league membership education, League members' vanguard exemplary consciousness educ...