Different grades of crystal polystyrene molding pellets range from 150,000 to 350,000 weight average molecular weight.不同牌号的结晶聚苯乙烯模塑粒料平均分子量范围从150,000-350,000.What factors does he take into consideration in determining the...
There was a lot of pressure on you to obtain good grades.你背负了拿到高分的巨大压力。Staff turnover is particularly high among junior grades.基层职员的流动率特别高。Are you in high school or are you still in the grades?你上中学了,还是仍在上小学?...