提高肝外胆管下段显示的方法有()①饮水②脂餐③胸膝位④侧转探头
A.①
B.①②
C.①②③
D.①②③④
E.①③④
参考答案:D
The aim of the trial operation of Shanghai Expo was to _______ problems, if any, so that the organizers could make changes accordingly.
A.search
B.identify
C.admit
D.handle
白暨豚终生生活于淡水中。