问题
单项选择题
DBS具有"数据独立性"特点的原因是因为在DBS中（）
A.采用磁盘作为外存
B.采用三级模式结构
C.使用OS来访问数据
D.用宿主语言编写应用程序
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
DBS具有"数据独立性"特点的原因是因为在DBS中（）
A.采用磁盘作为外存
B.采用三级模式结构
C.使用OS来访问数据
D.用宿主语言编写应用程序
参考答案：B
| 完型填空。 | ||||
| A doctor was once teaching a class of medical students at a famous 1 in London. An injured man was 2 in, and the doctor turned to 3 of the students and asked him, "What is 4 with the man?" "I don't know, sir," the student answered. "Shall I examine him and 5 out?" "There is no 6 to examine him," said the doctor. "You should know without asking questions. He has 7 his right knee. Don't you notice the way he walked? He hurt it by 8 it in the fire. You see his 9 are burnt away at the 10 .This is Monday morning. Yesterday was 11 , but on Saturday the roads were 12 and muddy. The man's trousers are muddy 13 .The man fell down on Saturday 14 ." The doctor then turned to the man and said, "You 15 your wages (周薪, 工资) on Saturday and went to a 16 house and drank too much. You 17 wet and muddy on the way 18 .You tried to dry your clothes 19 the fire when you got home. 20 you had drunk too much, you fell on the fire and burnt your knee. Is that right?" "Yes, sir," said the man. | ||||
|