【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...
【简答题】The Qingming (Pure Brightness) Festival is one of the 24 1, seasonal division points in China, falling on April 4-6 each year. After the festival, the temperature will rise up and 2, rainfall increase...
【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.
【简答题】Wuhan, we’d say... The only way we will defeat this outbreak is for all people to work together in a spirit of solidarity and cooperation. We are all together, and we can only stop it together. This i...