推广使用聚丙稀（PP）树脂管材，论述（PP）树脂管材的生产与应用。

The usage of PP resin pipe has been spread in this paper and its production and application have also been discussed here.

youdao

东莞科环机械设备有限公司成立于2003年，专业生产聚丙稀纺粘无纺布设备及无纺布。

Dongguan Kehuan Machineries Co., Ltd. was established in 2003, specializing in the production of polypropylene spunbond non-woven equipment and non-woven.

youdao

得到了幂率型非线性粘弹性材料，特别是改性聚丙稀的裂纹尖端应力、应变和位移场的解答。

The solution of the crack-tip stress, strain fields for the power law type nonlinear viscoelastic materials, especially for the modified polypropylene, is obtained.

youdao