儿童患者，消化道扭转的好发部位在（）
A.胃
B.小肠
C.横结肠
D.结肠肝曲
E.乙状结肠
参考答案：B
— Mother's Day is coming. What will you give to your mother?
— I will buy ____ some flowers. [ ]
A. her
B. she
C. hers
D. herself
加工精度与加工误差之间有什么关系
