食管腐蚀伤后最常见的狭窄部位是
A.食管入口
B.左支气管压迹处
C.主动脉弓压迹处
D.食管下段横膈以上
E.贲门
参考答案:D
Americans are making new friends all the time and few Americans stay in one place for a lifetime.
已知某井组月产水245t,月产油66t,月综合含水率是多少?