正畸螺旋扩弓器每转一圈可移动
A.0.5~0.6mm
B.0.2~0.3mm
C.0.1~0.2mm
D.0.3~0.4mm
E.0.4~0.5mm
参考答案:B
In the street I met the professor_______gave us a talk last week.
A.what
B.which
C./
D.who
请回答保持良肢位时的注意事项有哪些?