一年轻男子,饱餐后突发中上腹部刀割样剧痛,板状腹,最可能的诊断是()
A.胃溃疡
B.急性胃炎
C.急性胆囊炎
D.急性胰腺炎
E.以上都不是
参考答案:E
He works as an engineer now, but he________ on a farm for three years.[ ]
A. has worked
B. worked
C. was working
D. had worked
在Visual FoxPro中,有一个名为RSDA.DBF的表,它的结构复合索引文件名为______。