肝一颈静脉回流征阳性,常见于()
A.肺气肿
B.左心衰竭
C.右心衰竭
D.大量腹水
E.三尖瓣关闭不全
参考答案:C
So far this year we _____ a fall in house prices by between 5 and 10 percent.
[ ]
A. saw
B. see
C. had seen
D. have seen
刀作为烹调的主要工具,对于原料色、香、味、形及原料的初加工都起很大的作用。