Which type of the halogens is used in toothpaste to prevent dental caries?
A: iodine,
B: chlorine,
C: bromine,
D: fluorine.
A: iodine,
B: chlorine,
C: bromine,
D: fluorine.
举一反三
- Oral _________include any type of tissue abnormality in the mouth, like dental caries or cavities, ulcers, and gingivitis. A: lesions B: erosions C: incisions D: eversions
- Which one of the following microorganisms is closely associated with dental caries? A: C. albicans B: Streptococcus mutans C: P. melaninogenica D: Neisseria subflava E: S. epidermidis
- Which<br/>of the following is the predominant flora of the mouth that is the<br/>major cause of dental caries () A: α-hemolytic<br/>streptococci B: Lactobacillus C: epidermidis D: coli E: fragilis
- Which of the following is the predominant flora of the mouth that is the major cause of dental caries 未知类型：{'options': ['[tex=0.643x0.786]hlJJ6/DUY+n2/FE6M2JdRA==[/tex]-hemolytic streptococci', 'Lactobacillus', 'S. epidermidis', 'E. coli', 'B. fragilis'], 'type': 102}
- Which of the following staining solution are used in the bacterial Gram staining method？ ( ) A: Crystal violet B: Iodine solution C: Ethanol D: Safranin