继发性肺动脉高压的最常见的病因是下列哪一项
A.先天性心脏病
B.胸廓畸形
C.肺栓塞
D.慢性支气管炎并发阻塞性肺气肿
E.间质性肺疾病
参考答案:D
---Will you read me a story, Mummy?
--- OK. You_______have one if you go to bed as soon as possible.
A.might
B.must
C.could
D.shall
提升容器按其结构可分为()等。
A.罐笼
B.箕斗
C.矿车
D.吊桶