The American civil rights movement , based mainly in African American churches and colleges of the South, involved marches, boycotts, and extensive efforts of civil disobedience , such as sit-ins , as well as voter education and voting drives.
【简答题】(8分)(1)有三种有机物,其通式用C n H 2n O n-2 表示,当n依次为2,3,4时,其中能发生加聚反应获得常用高分子材料的是__________________(写结构简式,下同);水解后能生成乙酸和乙醇的是_______________;能被氢气还原为1一丙醇的是_________。 (2)1 mol含碳原子数为n mol的有机物完全燃烧,需O 2 mol。 若该有机物4.4g与足量...
【判断题】It is not only passion but dedication that allows an employee to stick with a job no matter whether it is in the heyday or it is in the tough time.