下列不属于种植义齿上部结构的()。
A.固定螺丝
B.中央螺丝
C.人造冠
D.水平螺丝
E.接圈固定螺丝
参考答案:B
It makes no________which road you take;both lead to the city,and they are equally long. [ ]
A. point
B. sense
C. matter
D. difference
中兴S380单板ALM1故障告警指示灯颜色状态为()
A、红光
B、黄光
C、绿光
D、紫光