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
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