[问答题,简答题] 试述静脉全麻的优、缺点。

PECT探测原理是基于（） ["光电效应","康普顿效应","湮没辐射","韧致辐射","电子对生成效应"] 图示为一牙源性肿瘤患者，生长缓慢逐渐增大可使颌骨膨大，下唇麻木，X线检查颌骨呈蜂房状，可能的诊断为（）   ["牙瘤","牙骨质瘤","成釉细胞瘤","牙源性腺样瘤","牙源性黏液瘤"] 下列脾虚带下过多的主症哪一项是错误的（） ["带下量多，色白或淡黄，质稀薄，无臭气，绵绵不断","面色白或萎黄，四肢倦怠","纳少便溏，四肢浮肿","五心烦热，失眠多梦","舌淡胖，苔白，脉细缓"] 卵子分别受精（） ["双卵双胎","单卵双胎，双羊膜囊、双绒毛膜","单羊膜囊双胎妊娠","联体儿","单卵双胎，双羊膜囊、单绒毛膜"] 丛集性头痛的发作持续时间（） ["≤2小时","2～4小时","4～72小时","72小时",">72小时"] 试述静脉全麻的优、缺点。