Tom, come __________, please.[ ]
A. over there
B. there
C. here
D. over
答案:C
矿物油的粘度大,膜系数也大。
返流性食管炎常继发()
A.食管癌
B.食管裂孔疝
C.食管静脉曲张
D.食管溃疡
E.食管憩室