当曲轴、传动轴等因磨损而需修复时,应当怎样修复?
参考答案:
当曲轴、传动轴等因磨损而需要修复时,应先用镍拉毛、再采用电弧热涂法喷涂45号钢或弹簧钢来修复。
---I feel terrible ,but I’ve just broken your ashtray.
---_________, for I had meant to change it.
A.Go head
B.No problem
C.it’s nothing to get upset about
D.I’ll look into it immediately
由于聚甲基丙烯酸甲酯塑料机械强度有限,临床常发生义齿基托折断,人工牙折裂等问题。容易折断的情况是()
A.咬合过紧,使基托过薄
B.义齿应力集中的部位
C.磨牙修复且颌间距离过小的义齿
D.恢复较小缺隙的人工牙腭侧基托
E.塑料使用不当,粉液比例失调