【单选题】In enterprises, the gateway is the computer that(67)the traffic from a workstation to the outside network that is serving the Web pages. In homes, the gateway is the(68)that connects the user to the i...
【简答题】 男性,45岁,反复黑便三周,呕血一天。三周前,自觉上腹部不适,偶有嗳气,反酸,口服西咪替丁有好转,但发现大便色黑,次数大致同前,1-2次/天,仍成形,未予注意。一天前,进食辣椒及烤馒头后,觉上腹不适,伴恶心,并有便意如厕,排出柏油便约600ml,并呕鲜血约500ml,当即晕倒,家人急送我院,查血红蛋白48g/L,收住院。发病以来乏力明显,睡眠、体重大致正常,无发热。70年代在农村插队,1979...