口令是的组合() ["字母","数字","汉字","字母与数字"]
患者男,36岁。2周前发现右下后牙牙龈有小包,平时无明显不适。检查见右下第一磨牙咬合面深龋,穿髓孔探无感觉,叩诊(±),右下第二磨牙根尖处牙龈有瘘管开口,挤压有少许脓液溢出。X线片见右下第一磨牙近中根尖X线透射区不规则,边界模糊。主诉牙的治疗是() ["充填治疗","塑化治疗","根管治疗","根尖手术","拔除"]
膀胱结石直径2cm,尿检白细胞1~3/HP。最佳治疗方法() ["膀胱镜碎石","膀胱切开取石","留置导尿消炎后,膀胱切开取石","体外震波碎石","药物排石"]
哪国的科学家第一次神经递质的存在?() ["法国","英国","日本","德国"]
身份认证的含义是() ["注册一个用户","标识一个用户","验证合法用户","授权一个用户"]
简述第一位置联锁有何作用?