诊断畸形中央尖，下列哪一项错误() ["A．多见于下颌第二前磨牙","B．常为对称性发生","C．该尖位于面颊、舌尖处","D．呈圆锥形突起","E．牙尖折断后，易致牙髓坏死"] 可反映胎儿成熟的羊水中肌酐浓度是() ["A．159.1μmol/L","B．176.8μmol/L","C．175.9μmol/L","D．132.6μmol/L","E．131.7μmol/L"] 用于新生儿特发性呼吸窘迫综合征的检查是() ["A．胎儿肾成熟度检查","B．胎儿肺成熟度检查","C．胎儿肝成熟度检查","D．胎儿皮脂腺成熟度检查","E．胎儿唾液腺成熟度检查"] 血清hCG峰值出现在() ["A．停经第一天","B．妊娠8～10周","C．妊娠2～5周","D．分娩前","E．分娩时"] 妊娠诊断试验中特异性强且敏感性高的方法是() ["A．胶乳凝集抑制试验","B．单克隆抗体二点酶免疫法","C．hCG放免试验","D．单红细胞凝集抑制法","E．胶乳凝集抑制浓缩试验"] 检测胎儿先天缺陷的标本取样最佳时间是()