前牙PFM全冠牙体预备时,唇面颈部边缘形式下列哪项是不正确的()
A.直角肩台
B.斜面肩台
C.小于90°肩台
D.浅凹形
E.浅凹-斜面形
参考答案:C
If the bottle of gas________fire, the whole building may _________.[ ]
A. catches ; be burned to the ground
B. will catch ; be burned down
C. is on ; burn down
D. will be on; be burned down
制作面包、糕点、蛋糕应选择什么技术指标的小麦面粉?