【简答题】患者 12 小时前乘坐拖拉机时,撞车,被木柱击中腹部,腹壁挫伤后剧痛,休息后逐渐缓解,但半日后腹部又开始疼痛,持续钝痛,伴有腹胀,逐渐加重,遂来院就诊。查体 : T 37.6 °C P 80 次 / 分, R 20 次 / 分, BP118/ 78mmHg 。神清,腹稍胀,脐周可见挫伤痕迹,全腹均有压痛,而以中腹部最重,腹肌稍紧张,反跳痛明显,肝浊音界存在,移动性浊音 (+) ,肠鸣音甚弱,听不清...
【简答题】The most general approach to visibility is dE=-Eb ext dx (2.5) where E is the light intensity of a collimated beam of light, b ext is the extinction coefficient, which is the sum of the four separate...