事务的持久性是由DBMS的什么来实现的A．事务管理子系统 B．并发_爱下问搜题

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问题单项选择题

事务的持久性是由DBMS的什么来实现的

A．事务管理子系统

B．并发控制子系统

C．恢复管理子系统

D．完整性约束机制

答案

参考答案：C

完形填空

The Spring Festival marks the first day of a new year, so the first meal is rather important. People from the North and the South have different 36 about the foods they eat on this 37 day. In Northern China, people 38 eat Jiaozi. The word Jiaozi in Chinese means the 39 and the beginning of time. According to historical 40 , in the past people from the North and the South both ate Jiaozi on Chinese New Year’s Day. Perhaps 41 the areas in Southern China 42 more rice than those in Northern China, southern people slowly 43 to eat many other kinds of food on New Year’s Day. 44 , the most common foods for the first 45 are noodles, New Year Cake and Tangyuan. The noodle 46 long life. The New Year Cake is called Niangao in Chinese, which 47 the hope of improvement in 48 year after year. Tangyuan is a symbol of 49 according to the Chinese.
To 50 a New Year visit to relatives and friends is an important activity during the Spring Festival. People also send cards to 51 a New Year’s greeting. What children love most is to set off firecrackers. 52 , as the pace of life is becoming faster and faster, people have 53 new ways to celebrate the Chinese traditional New Year. For example, many people no longer send out greeting cards. 54 , they use short messages or emails. Also to travel during the New Year holidays has come into 55 .

B．unforgettable

C．Consequently

B．Unfortunately

B．Fortunately

D．Furthermore

多项选择题

评价纠正措施的需求时，需要实施哪些活动？（）

A.评审和分析不合格

B.确定发生潜在不合格的可能性

C.确定不合格的原因

D.确定是否存在或可能发生类似的不合格