脑断层显像所用OM线,是指()
A.前额-小脑连线
B.眼-枕骨连线
C.眼-小脑连线
D.眼-耳连线
E.垂直于身体长轴的连线
参考答案:D
She has been skating for _____. [ ]
A. three and half years
B. three and half a year
C. three and a half year
D. three years and half
硬质合金是由碳化钨、碳化钛粉末,用钴作黏结剂,经()、高温煅烧而成。
A.高压成型
B.铸造
C.加工
D.冶炼