chain proportion

1

The effect of different kind of polyether polyols , free-NCO group content , chain extenders and proportion of them and the proportion of-NCO group with compound contain reactive hydrogen atom on the physical and mechanical properties of polyurethane elastomer were discussed .

考察了不同种类多元醇、半预聚物中-NCO基团百分含量、不同扩链剂及其不同配比-、NCO对活泼氢化合物过量比等对聚氨酯弹性体的影响。
2

In view of the special requirements of infrastructure for the cold chain logistics , the proportion of outsourcing for the core businesses is relatively large to the extent .

鉴于冷链物流对于基础设施的特殊要求，核心企业对其外包的比例比较大。