【简答题】Why is it important to know how to take a good smart phone self-portrait? Because knowing how to take a good smart phone self-portrait has been an important ________for young people.
【简答题】甲基丙烯酸甲酯以过氧化二苯甲酰为引发剂,以乙酸乙酯为溶剂于60℃进行聚合反应。已知:反应器中聚合物总体积为1L,密度为0.878g·cm -3 ,单体质量300g,引发剂用量为单体用量的0.6%,k d =2.0×10 -6 s -1 ,k p =367L·mol -1 ·s -1 ,k t =0.93×10 7 L·mol -1 ·s -1 ,f=0.8,C I =0.02,C M =0.18×...