用纯双官能团硅醇缩聚得到的高分子线形缩聚物称为( )。
A．硅油B．固性有机硅树脂C．硅橡胶D．塑料
参考答案：C
He had to take the medicine three times a day, so as to be _____ pain in the leg. [ ]
A. far from
B. away from
C. apart from
D. free from
（）方式能够产生与工作平面图形重叠的缺陷面积记录。
A.A型扫描
B.B型扫描
C.C型扫描
D.以上都是
