硫化过程的硫化平坦期胶料发生什么变化？
参考答案：
硫化平坦期时交联反应已趋于完成，反应速度已缓和下来，随之而发生交联键的重排，热裂解等反应。
短文改错。
As the world enters the 21st century , the development in the science and technology will bring us
much more new hopes and chances we've never imagined before .People are hoping have a peacefully
and highly developed world .To catch up with the new development and to be success in the new
century, the younger generation is required to have different kind of skills and abilities ,such like the
computer science and the English language .Otherwise one will be leaving behind .Young people
should study even hard at school and prepare themselves mentally and physically to meet with the
challenge of the new century .
____________________________________________________________________________
标准板状拉伸试样，拉伸后测量试样宽度方向的真实应变εb=0.003，厚度方向的真实应变εa=0.002，计算试样的塑性应变比r？
