题型:单项选择题 患者男,34岁,2小时前突然呕出咖啡色胃内容物约2000ml,伴柏油样大便2次,血压88/44 mmHg,心率124次/min此时最合适的治疗措施是A.大量输液B.急诊内镜止血C.输血、补液D.输右旋糖酐E.外科手术 查看答案
题型:单项选择题 Even though the main source of ______ exposure for a majority of the human population is the sun, the artificial tanning from sun beds contributes significantly to the total UV risk.A.extra violentB.extra violetC.ultravioletD.ultravirus 查看答案