患者有上腹痛史,经常黑便及呕血、反酸,应考虑()
A.胃十二指肠溃疡出血
B.胃癌出血
C.食管静脉破裂出血
D.应激性溃疡出血
E.胆道出血
参考答案:A
All the vegetables in the shop _____. [ ]
A. have been sold up
B. has been sold up
C. have sold up
D. has sold up
羊水主要来源于()。
A、羊膜上皮细胞分泌
B、母体血液的渗透
C、胎儿尿液
D、胎儿血液
E、以上都不是