The results show that a small amount of NBR can greatly improve the environmental stress crack resistance(ESCR) and the impact strength of HDPE.

实验结果表明：少量的NBR能大幅度提高HDPE的冲击韧性和耐环境应力开裂性能。

youdao

These indicators are done based on data during 2000-2004 year under the limitation of availability and quality. These indictors have shown that the ESCR in China have been improved these years.

考虑到数据的可得性和真实性，我们选择了2000-2004五年期来制作指数，这些指数都反映出中国经济、社会和文化权利的改进情况。

youdao