右心衰竭时较早出现的临床表现是（）
A.上腹胀满
B.颈静脉充盈和怒张
C.肝大
D.对称性下肢凹陷性水肿
E.腹腔积液
参考答案：B
列举历史上三种文学分类的方法？
________had the worker who was badly injured in that accident stopped breathing and died________ doctors arrived.
A．Almost; when
B．Hardly; when
C．Not; until
D．Hardly; before
