主肺动脉窗层面包括哪些解剖结构()
A.左心房
B.头臂静脉
C.升主动脉和降主动脉
D.奇静脉弓通常也位于此层面
E.降主动脉、气管
参考答案:C, D, E
—________ one and a half months enough for the project to be finished?
—I am afraid not. The professor is ill and only after he recovers ________ go on with it.
A.Is; he can
B.Are; he can
C.Is; can he
D.Are; can he