以下关于牙体预备中牙髓保护的说法中错误的是（）
A.牙体预备分次完成
B.轻压磨切
C.尽量少磨牙
D.预备时间歇、短时磨切
E.水雾冷却
参考答案：A
腹部术后切口裂开，哪项是错误的：
A．吸烟者多见
B．营养不良
C．腹腔压力增高
D．长期激素治疗
E．拆线过早
Which of the following did not contribute to the popularization of newspapers().
A.New technology and compulsory education.
B.Industrialization.
C.Population growth.
D.Urbanization.
