Which of the following statements about the dentin is/are incorrect: ()
A. It is softer than the enamel.
B. It is beneath the enamel and cementum.
C. It is white and transparent.
D. It surrounds the pulp cavity.
E. It makes up the bulk of the tooth.
查看答案
The tooth that can be extracted by the rotating force is the ()
A. The maxillary central incisor
B. The mandibular central incisor
C. The maxillary lateral incisor
D. The mandibular lateral incisor
E. The premolar
Which tooth has the developmental grooves shaped like a cross?()
A. The maxillary first molar
B. The mandibular first molar
C. The maxillary second molar
D. The mandibular second molar
E. The mandibular second premolar
Which of the following descriptions about the mandibular canine is incorrect: ()
A. Its root is oblate and slender
B. There is the shallow and elongated depression on the distal surface of the root
C. The length of the distal slope of the cusp is twice as long as the length of the mesial slope
D. the angle of intersection of the mesial and the distal slopes is greater than 90 degrees
E. it can be extracted by the rotating force
During mastication, the occlusal contact occurs at the which of the teeth.()
A. buccal surface
B. lingual surface
C. mesial surface
D. distal surface
E. occlusal surface
微信支付 
支付宝支付