【单选题】现有两种高聚物A、B,A能溶于氯仿等有机溶剂,并且加热到一定温度时,熔化成黏稠状的液体,B不溶于任何溶剂,加热不会变软或熔化,则下列叙述不正确的是 [ ]
A.
高聚物A可能具有弹性,而高聚物B一定没有弹性
【简答题】For this part, you are allowed 30 minutes to write a short essay on living in the virtual world . Try to imagine what will happen when people spend more and more time in the virtual world instead of i...
【判断题】在冰雪道路上行车时,车辆的稳定性降低,加速过急时车轮极易空转或溜滑。
【简答题】文件系统中,用于文件的描述和控制并与文件一一对应的是 。
【简答题】Retailers and marketing firms have found that______with people in the virtual world.