乙状结肠扭转可靠X线征象是（）。
A.小肠内气液平面
B.结肠充气扩张
C.钡灌肠直肠上端呈鸟嘴状梗阻
D.腹部为马蹄状影
E.腹部为咖啡豆征
参考答案：C
肥胖指超过标准体重（）。
A.20%
B.10%
C.15%
D.25%
E.30%
The subjects in our school are ________those in their school. [ ]
A. the different from
B. the same from
C. the same as
D. the different as
