超基因属于()Hinf家族属于()在人类基因组中占约20%的重复序列是() ["A．短串联重复序列","B．长串联重复序列","C．低度重复序列","D．长分散重复序列","E．高度重复序列"]
患者，男性，左下后牙自发痛，冷、热痛3天。检查：左下6牙冠无明显龋坏，叩(+)，松动Ⅱ度，近中牙周袋9mm，冷试验疼痛持续。该牙最可能的诊断是() ["A．慢性牙髓炎","B．急性牙髓炎","C．逆行性牙髓炎","D．创伤","E．牙髓充血"]
患者右下6龋洞深，探不敏感，热试验引起疼痛，刺激去除后，持续时间长，其原因可能是() ["A．急性牙髓炎","B．可复性牙髓炎","C．慢性牙髓炎","D．慢性增生性牙髓炎","E．牙髓坏死"]
患者1年前上前牙外伤后，牙冠逐渐变黑，无明显疼痛，从病史看，该牙的诊断可能为() ["A．根折","B．牙髓坏死","C．牙内吸收","D．牙外吸收","E．慢性根尖周炎"]
诊断牙髓坏死，最主要的临床检查是() ["A．视诊","B．温度测验","C．光纤透照测验","D．开髓后诊断","E．电活力测验"]
病毒生物学性状及感染的致病性主要取决于()决定病毒与宿主表面结合的是()
