教学过程Step 1. Warming up (热身)1. Sing a song “W hat are you doing?”.2. Free talk: Good morning, children. Look outside, what’s the weather like today?(谈论天气)
The copolymerization of 4-vinylbenzyl chloride(VBC) and vinyl acetate(VAC) was carried out in toluene at 75℃via radical polymerization using 2,2’-azo-bis-(iso