危害最大的是() ["A．牙髓炎","B．根尖周炎","C．死髓牙","D．牙周炎","E．残根"]
蛋白质不变性又不沉淀是由于加入了()蛋白质变性但不沉淀是加入了() ["A．生理盐水","B．常温乙醇","C．加入2%醋酸后加热","D．高浓度硫酸铵","E．加热煮沸"]
以下哪一项不属于牙髓温度测试时必须注意下列事项() ["A．先测对照牙，后测患牙","B．须隔离唾液","C．先测上牙，后测下牙","D．要进入龋洞内测试","E．要放在牙面的中1/3部位测试"]
翻译前体的RNA是()细胞内含量最多的RNA是()蛋白质翻译的模板是()核小体RNA是() ["A．hnRNA","B．mRNA","C．snRNA","D．rRNA","E．tRNA"]
牙髓电活力试验患牙读数比对照牙牙明显不同，可判断患牙() ["A．有无隐裂","B．牙髓是否坏死","C．有无咬合创伤","D．是否为急性牙髓炎","E．有无牙髓充血"]
兼具有质粒载体和噬菌体载体性质的载体是()容载量最大的载体是()
