Over a three-month period, there was no statistically significant difference in injury risk between the pre-run stretching and non-stretching groups.
在三个月中，两个群体之间在伤害风险统计上没有太大的区别。
2
For the process of the fiber taper drawing, the pre-heating time and stretching speed are carefully examined for parameter optimization.
在加热拉伸过程工艺方面，本文从预加热时间和拉伸速度两个角度进行研究，对参数进行优化处理。
3
The effect of quenching temperature, the interval time from quenching to aging and aging institution to 2A70 aluminium alloy pre-stretching plate structure and properties are introduced.