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.弹力、弹簧测力计一、弹力1、定义： 2、方向： a.支持力/压力： b.拉力（绳）： 例 1、为了探究力能否使玻璃瓶发生形变，小林把玻璃瓶装满水，然后用带有细玻璃管的橡胶塞塞紧瓶口，组装好的实验装置如图 20 所示。其中，细玻璃管上有刻度，便于观察细玻璃管内水面的变化。小林用力挤压玻璃瓶壁，发现细玻璃管内水面上升了。于是他得出结论：细玻璃管内水面上升，表明力使玻璃瓶发生了形变。小华却认为：细玻璃管内水面上升，可能是由于手挤压玻璃瓶壁时，瓶内水的温度升高所致，因此不能说明力使玻璃瓶发生了形变。要求：只利用如图所示的装置，通 过实验证明力能使玻璃瓶发生形变。请 你写出主要实验步骤和相应的实验现象。 二、 弹簧测力计1、原理： 在弹性限度内，弹簧受到的拉力与它的形变量成 ； 2、使用 A.“三观察”： 、 、 B.注意事项： ① ② ③ ④ 例 2、如图所示的弹簧测力计的示数是 N。 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 education, excellent league members' educ...
