The tooth is usually divided into three parts ( ).
A: Tooth crown
B: Tooth neck
C: Tooth surface
D: Tooth root
E: Tooth foot
A: Tooth crown
B: Tooth neck
C: Tooth surface
D: Tooth root
E: Tooth foot
A,B,D
举一反三
- For soft tooth surface gear transmission, the hardness of the tooth surface should be selected A: Pinion tooth surface hardnesslarge gear tooth surface hardness B: Pinion tooth surface hardness≤large gear tooth surface hardness
- 以眼还眼，以牙还牙。 A: An eye for an eye and a tooth for a tooth. B: An eye for a eye and a tooth against a tooth. C: An eye for two eyes and a tooth for a tooth.
- tooth
- A tender tooth is ______.
- You need to brush your after . A: tooth, eat B: teeth, eating C: tooth, eating D: teeth, eat
内容
- 0
A tooth root is under the ( <br/>). A: bone B: pulp C: gums
- 1
What would the doctor do next? A: He would remove the tooth of Lucy. B: He would wash the tooth of Lucy.
- 2
Why did the woman go to the doctor’s a few days ago A: She had a bad tooth taken out. B: She had her new tooth examined. C: She had a false tooth filled in.
- 3
Linda would like to have a electronic_____ to clean her_____. A: toothbrush, tooth B: teethboobrush, teeth C: toothbrush, teeth D: teethbrush, tooth
- 4
The ( ) keeps the tooth in<br/>place by securing it to the bone. A: crown B: bone C: periodontal ligament