属于发绀型先天性心脏病的肺血管畸形为()
A.肺动脉狭窄
B.肺动脉闭锁
C.先天性单侧肺动脉缺如
D.肺动静脉瘘
E.特发性肺动脉扩张
参考答案:B, D
----Do you mind taking the guitar to the office for me?
----_______ . Put it in my car,please..
A.Not at all
B.Of course
C.Yes,I do
D.Never mind
物体由于______而具有的能叫动能.试举出生活中物体具有动能的两个实例:
(1)______
(2)______.