产生激光的条件有() ["A．光学谐振腔","B．激励能源","C．具有亚稳态的工作物质","D．自发辐射","E．韧致辐射"]
激光的特点有() ["A．相干性好","B．方向性好","C．强度大","D．单色性好","E．贯穿本领好"]
嵌顿性疝
腹股沟斜疝
为了加速蒸发器的蒸发速度，下列哪些方法可实现() ["A．给蒸发器直接加热，且保证麻醉药液不受破坏","B．蒸发室内装吸收芯，并将其下部浸泡于麻醉液体中","C．将气体通入麻醉液体中，增加接触面积","D．增加麻醉药液表面气流量","E．给蒸发器间接加热"]
腹外疝
