慢性阻塞性肺疾病发生单纯低氧血症最重要的机制是()。
A.肺泡通气量下降
B.通气/血流比例失衡
C.弥散功能障碍
D.肺内分流
E.膈肌疲劳
参考答案:B
报送国家药品监督管理局的药品注册申报资料中需几套完整的资料
A.1套
B.2套
C.3套
D.4套
E.5套
完成句子
①在互联网上距离已不成问题.
______________ is no problem on the Internet.
②那车跑得真快,不久就消失在远方了.
The car ran so fast that it soon disappeared______________
③有人告诫她说,如果不想受到伤害,就离查尔斯远一点.
She was warned to__________________Charles if she didn't want to get hurt.