机械通气期间，病人与呼吸机对抗的原因有 ["A．疼痛","B．严重缺氧","C．通气量不足","D．呼吸机有轻微漏气或压力调节太高","E．病人不习惯"]
长期机械通气的并发症有 ["A．氧中毒","B．肺部感染","C．肺损伤","D．低血压","E．通气过度"]
使用PEEP可使病人 ["A．萎陷的肺泡重新扩张","B．增加FRC和肺顺应性","C．改善通气","D．改善氧合","E．减少肺内分流"]
氧疗可通过提高吸入气中的氧浓度，缓解或纠正机体缺氧状态。以下哪些是氧疗的适应证 ["A．胸腹部手术后","B．中枢神经系统疾病","C．药物镇静状态","D．慢性肺部疾病","E．严重贫血病人"]
牙按形态和功能可分哪几类？举例说明如何用牙式来标示恒牙和乳牙？
牙周组织包括哪些部分？
