遗传性α1-抗胰蛋白酶缺乏与下列哪种肺气肿的发生关系密切()
A.小叶中央型肺气肿
B.全小叶型肺气肿
C.混合型肺气肿
D.间质性肺气肿
E.肺大泡
参考答案:B
— You may find the key to the maths problem on page 107.
— Ah, it's so simple. I wonder why I _____ of that. [ ]
A. hadn't thought
B. haven't thought
C. didn't think
D. wasn't thinking
(2)是系统建模的替代方法,是可选的系统设计方法,经常用于系统开发项目中,特别是用户难以陈述或者可视化业务需求时。
A.设计用例
B.数据建模
C.结构化功能需求
D.建立原型