單項選擇題關(guān)于上消化道出血時胃鏡檢查錯誤的是：（）

A.是診斷出血病因的首選檢查方法
B.多在出血后24-48小時內(nèi)進行
C.多在出血后48-72小時進行
D.可判斷是否繼續(xù)出血或估計再出血的危險性
E.可同時進行內(nèi)鏡止血治療


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1.單項選擇題對上消化道出血時出血量的估計最有價值的標準是：（）

A.血紅蛋白濃度測定
B.血細胞比容測定
C.嘔血與黑糞的頻度與量
D.網(wǎng)織紅細胞測定
E.血容量減少所導致的周圍循環(huán)衰竭的臨床表現(xiàn)

2.單項選擇題The following is true of haematemesis：（）

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.