抽牙神经为什么那么贵
首先根管治疗是分牙位的,分为3类:前牙、前磨牙(双尖牙)和磨牙。前牙治疗因为简单所以价格也是最低的,前磨牙其次,磨牙因为牙根复杂并且操作不方便,所以价格最贵。<br>其次如果该牙齿之前曾经做过根管治疗,但是没有治疗彻底导致牙齿再次发炎,那么第二次做根管治疗的话费用要比第一次要贵,主要是因为第二次治疗难度更大。<br>所以专业牙医建议您如果牙齿蛀掉了,千万不能拖着不管,俗话说“小洞不补,大洞受苦”讲的就是这个道理。<br>(安庆渡江口腔医院 严世明)
以元音音素开头的字母:<br>A a [ei] E e [i:] I i [ai] O o [əu] F f [ef] M m [em] N n [en] S s [es]<br>X x [eks] L l [el] H h [eit∫] R r [ɑdu:]<br>12个单元音zhi:dao<br>短元音[əe] [e] [i] [כ] [ ] [u] [ə]<br>长元音 [i:] [כ:] [a:] [u:] [ə:]<br>8个双元音: [ei] [ai] [əu] [au] [כi] [iə] [eə]<br>[uə]<br>26个字母的音标:<br>A a [ei] B b [bi:] C c [si:] D d [di:] E e [i:] F f [ef] G g [dʒi:] H h [eit∫] I i [ai] J j [dʒei] K k [kei] L l [el] M m [em] N n [en] O o [əu] P p [pi:] Q q [kju:] R r [ɑ:] S s [es] T t [ti:] U u [ju:] V v [vi:] W w [′d∧blju:] X x [eks] Y y [wai] Z z [zi:][zed]<br><img><br><img><br>20个元音音素对应元音音素例子:<br>1) [i:] sea, he, see, piece, ceiling<br>2) [i]sit, build, miss, myth<br>3) [e] bed, desk, head,<br>4) [ae] bad, land, bank, stamp (a和e中间是连起来的)<br>5) [ɔ] hot, want<br>6) [ɔ:] door, more, sport, ball, warm, author, court, bought, caught<br>7) [u:] who, blue, soup,<br>8) [u] look, put, woman, could<br>9)[a:] car, fast, class, plant, calm, aunt<br>10) [ʌ] cup, come, blood, rough<br>11) [ə:] girl, work, serve, nurse<br>12) [ə] cadre, ago, forget, polite, dollar, doctor, famous, Saturday<br>13) [ei] cake, they, play, eight, great, 14) [ai] bike, die, neither, light, try, find, height, eye<br>15) [əu] phone, cold, boat, soul, grow<br>16) [au] house, town<br>17) [ɔi] boy, oil<br>18) [iə] dear, idea, deer, here, fierce,<br>19) [ɛə] pear, care, there, fair<br>20) [uə] tour, poor,<br>a 与an区别,有一条就是an