The feasibilityof using all s talk bluish dogbane bleached pulp instead of chemicalwood pulp mix with other pulp to produce newsprint has been researchedmainly.

 
  • 重点研究了全杆红麻漂白浆代替化学木装配抄普通新闻纸的可行性。
今日热词
目录 附录 查词历史