Through the separation, lignosulfonate with narrow molecular weight distribution was obtained and then chemically modified.木质素磺酸盐是一种常见的普通减水剂, 其分子量分布较宽,从而影响减水剂性能.The graft mechanism of lignosulfonate and acrylic acid was ...
Governors are using the increased powers given to them to act against incompetent headteachers.董事们运用赋予他们的更大权力罢免不称职的校长。Headteachers are more involved in administration than in teaching.校长的行政工作比教学工作多....
...students who play intercollegiate athletics.参加大学校际体育竞赛的学生He takes part in the intercollegiate sports every year.他每年参加大学校际运动会.intercollegiate athletic competition大学校际体育竞赛This competition revealed the high English stand...