上消化道出血量小于800ml时,病人的表现包括()
A.虚弱、焦虑和出汗
B.皮肤苍白、寒冷
C.呼吸困难
D.通气过度
E.体温升高
参考答案:A, E
There are too many difficulties for us _______ . We really don’t know _______ to do.
A.to deal with, what
B.to deal with, how
C.to do with, how
D.to do with, what
名山类或喀斯特地貌的特点及影响因素?