起重机械中的滑轮,对于(),圆盘上应带有刚性筋和孔。
A、直径较大的滑轮
B、直径较小的滑轮
C、重级或特重级
D、轻级或中级
参考答案:A
Most of the students in our class like to read China Daily, which________every day. [ ]
A. comes out
B. comes up
C. come across
D. comes about
FR-Ⅲ型适用于下列哪类错()
A.安氏Ⅰ类牙列拥挤
B.安氏Ⅱ类1分类错
C.安氏Ⅱ类2分类错
D.安氏Ⅲ类错
E.开