急性脓胸拔除闭式引流管主要依据（）
A.体温恢复正常
B.脓腔消失，肺完全膨胀
C.白细胞降至正常
D.脓汁每天少于50ml
E.呼吸困难消失
参考答案：B
34. —He failed his exam again.
—But what did you _____? Had he ever been working hard?
A．think
B．expect
C．consider
D．imagine
属四环三萜类化合物是
A．银杏内酯
B．甜菊苷
C．紫杉醇
D．甘草甜素
E．黄芪皂苷Ⅶ
