【单选题】要在表中删除字段,一般( )
B.
如果存在引用的话,先删除其他对象对该字段的引用
C.
如果存在重要数据的话,先保存好该字段的重要数据
【单选题】《诗经·大雅·假乐》中“假”是什么意思?
【简答题】Scientists find that hard-working people can live longer than idle(不工作的) people. Career women are healthier than housewives. Evidence shows that the jobless are in poorer health than the job-holder. A...
【简答题】The scientists were puzzled by the tricky question which left them __________ for an answer.
【简答题】Why do some people live to be older than others? You know the standard explanations :keeping a moderate diet,engaging in regular exercise,etc. But what effect does your personality have on your longev...
【单选题】适用于皮肤松弛部位腧穴的进针方法是( )
【判断题】循环的重数是由循环语句的个数决定的,有多少个循环语句,就是多少重循环。
【单选题】要在表中删除字段,一般的,( )。
B.
如果存在引用的话,先删除其他对象对该字段的引用
C.
如果存在重要数据的话,先保存好该字段的重要数据