焊接接头热影响区内强度高、塑性低的区域是( )。
A.熔合区
B.正火区
C.加热在1200℃的粗晶区
D.整个热影响区
参考答案:A
I remembered _____ the door before I left the office, but forgot to turn off the lights.
A.locking
B.to lock
C.having locked
D.to have locked
邻合面洞填充3周后填充物折裂,无咬合痛,可以排除的原因是
A.鸠尾峡过窄
B.轴髓线角过锐
C.邻面洞的龈壁深度不够
D.过早受力
E.有咬合高点