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.和密度有关的计算一.单位换算例题 1：1.0×103 kg/m3= g/cm30.9g/cm3= kg/m 3二、用密度鉴别物质例题 2：体育锻炼用的“铅球”，质量为 4kg，体积为 0.57dm3 ，这个“铅球”是铅做的吗 ？三、推断空心实心三种方法：a.比较质量b.比较体积c.比较密度计算时假设物体是实心的例题 3：一个体积为 20cm3，质量是 89g 的铜球，这个球是实心的还是空心的？假如是空心的，空心部分的体积多大？4、不同物质混合例题 4：将一个体积为 20cm3的空心铜球的空心部分灌满水银，测得总质量是225g ，水银体积多大？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' education, etc. Under the premise of ensuring the quality, the development quantity of league members will increase steadily, and the ranks of league members in middle schools will be strengthened constantly. It is planned to develop a group of new league m...
