急性左心功能不全的体位是()
A.自主体位
B.强迫仰卧位
C.强迫坐位
D.强迫蹲位
E.辗转体位
参考答案:C
He hasn't finished his homework _____. [ ]
A. already
B. yet
C. never
D. ever
鱼鳞可以分为(),(),()三种.