龋病(dental caries,tooth decay)是牙在以细菌为主的多种因素影响下发生慢性进行性破坏的疾病。我国发病率大约在()之间
第1题:
第2题:
30%-55%
35%-60%
40%-65%
45%-70%
第3题:
第4题:
voiceless, post-alveolar, and affricative
voiceless, dental, and fricative
voiced, dental, and fricative
voiced, post-alveolar, and plosive