试述再生活化剂的作用？
参考答案：
使用少量活化剂可大幅度缩短，脱硫时间，改善再生胶工艺性能，减少软化剂用量，提高再生胶质量。
his being late again, he lost his job and had to stay at home.
A．Because
B．As result of
C．In case that
D．Because of
关于腕关节的活动范围，下列错误的是（）
A.背伸70°
B.掌屈80°
C.桡侧偏25°
D.尺侧偏50°
E.中立位0°
