第二代数据库系统是指
A.层次型数据库系
B.网状型数据库系统
C.分布式数据库系统
D.关系型数据库系统
参考答案:D
解析: 第二代数据库系统指支持关系模型的关系数据库系统。
完成对话 通读下面的对话.然后根据上下文补全对话内容。
Gina: Hi, Mary. Your skirt is so beautiful.
Mary: Thank you very muck
G: 小题1: ?
M: I bought it in Yunnan.
G: Yunnan? Oh, you are so hcky.小题2: ?
M: Yes, I went there last summer. I had a good time.
G: 小题3: ?
M: It was sunny and warm. I visited many beautiful places.
G: 小题4: ?
M: The people there are very friendly and kind.
G: I hope to visit it one day.
M: I’m sure you’ll love it.
G: I think I will. Oh, I’m afraid I must go now, See you.
M: 小题5: .
外周血出现较高比例的中晚幼粒细胞,NAP染色粒细胞呈强阳性反应,骨髓象基本正常()
A.慢性粒细胞白血病
B.MDS
C.类白血病反应
D.急性白血病
E.慢性淋巴细胞白血病