问题 填空题

数据库系统在运行过程中,可能会发生故障。如果系统在运行过程中,由于某种原因,造成系统停止运行,致使事务在执行过程中以非正常方式终止,这时内存中的信息丢失,而存储在外存上的数据不受影响,这种故障叫做______;如果系统在运行过程中,由于某种硬件故障,使得数据库中的数据部分或全部丢失,这种情况称为______。前者的恢复由______完成,后者的恢复由______完成。

答案

参考答案:系统故障
介质故障
DBMS
DBA

阅读理解

阅读短文,选择正确答案。

    Every country has its own way of cooking. American people have their way of cooking, don't they?

    Most people in the United States like fast food. But if you think that American people don't like cooking, you

are wrong. It's true that most Americans take fast food as their breakfast and lunch. But they also think cooking

is interesting. Parents see the importance of teaching their daughters how to cook. And most Americans say that

home-cooking meal is the best.

    Americans have their own way of cooking. For example, baking (烘烤) is the most popular way of cooking

in America. We can see ovens (烤炉) in most American families. American cooks pay attention to the balance

of food. In order to plan a big meal, they try to cook meat, a few vegetables, some bread and often some sweet

food in different colors on the plate, so the food is healthy and looks beautiful, too.

1. Most Americans _______. [ ]

A. don't like cooking

B. cook food in the morning

C. like home-cooking meal

D. don't like home-cooking meal

2. It's true that most Americans _______. [ ]

A. take fast food as their dinner

B. have fast food as their breakfast

C. cook meat as their breakfast

D. only like sweet food

3. _______ is the most popular way of cooking in the U.S.A. [ ]

A. Baking

B. Frying.

C. Boiling

D. Steaming

4. How does a cook make the balance of food? [ ]

A. He tries to cook a lot of meat.

B. He tries to cook meat, vegetables, bread and sweet food for a big meal.

C. He tries to make the food delicious.

D. He tries to cook a lot of sweet food.

5. Which is right according to the passage? [ ]

A. The meal looks beautiful because the food on the plate is in different colors.

B. American people do not like to cook food at home.

C. American parents do not like to teach their children to cook.

D. American people don't think home-cooking food is the best.

单项选择题