This paper studied the structure and properties of propylene-ethylene block copolymer (PP-B) as speciality resin for tubing.
研究了乙丙嵌段共聚聚丙烯(PP - B)管材专用树脂的结构与性能。
Non-poisonous, good light-resistant and heat-resistant color was used for manufacture of the color master batch applied for PP-R, PP-B pipe materials.
采用无毒、耐候性好、热稳定性高的颜料制得PP-R、PP-B管材料专用色母粒，考察了色母粒对PP-R、PP-B管材料力学性能、耐热性、耐光性、卫生安全性的影响。
Jacobs, Allan B. "Making Great Streets. " Chap. 4 in Great Streets. Cambridge, MA: MIT Press, 1993, pp. 269-308.
著，《美丽街道》第四章〈创造好的街道〉，麻州，剑桥：麻省理工学院出版，1993年，第269-308页。
For Group B, the vitalight lamp radiation and steaming of methanal plus PP were used in combined air sterilization.
紫外线灯照射与甲醛加PP熏蒸联合空气消毒为B组。
Appendix b: Mobilization Scope of Services. Volume 1, section II, pp. 1-4.
附录b：服务范围的多变性，第一卷第二部分，第1- 4页。
Appendix b: Mobilization Scope of Services. Volume 1, section II, pp. 1-4.
附录b：服务范围的多变性，第一卷第二部分，第1- 4页。
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