A.血紅蛋白濃度測定B.血細(xì)胞比容測定C.嘔血與黑糞的頻度與量D.網(wǎng)織紅細(xì)胞測定E.血容量減少所導(dǎo)致的周圍循環(huán)衰竭的臨床表現(xiàn)
A.When it occurs ina patient with alcoholic liver disease,it is always due to oesophageal varices. B.A visible vessel seen at gastroscopy is not a risk factor for further bleeding. C.When it occurs in patientsover 70 years of age who may have arthritis,ususlly indicates malignancy. D.When it occurs afrer repeated retching,it is suggestive of an oesophageal tear. E.When it is caused by duodenal ulcer,a partial gastrectomy is usually necessary.