牙体缺损修复时如腐质未去净或修复体边缘不密合使用一段时间后会产生继发性龋而出现
A.过敏性痛 B.自发性痛 C.咬合痛 D.龈炎 E.修复体松动
参考答案:B
Peter received a letter just now his grandma would come to see him.[ ]
A. saying
B. Said
C. to say
D. says
把一个长方形木框拉成一个平行四边形,它的面积将( )[ ]
A.变大
B.变小
C.不变