皮皮学，免费搜题
登录
搜题
【简答题】
混合液悬浮固体浓度（MLSS）
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】要在表中删除字段,一般( )
A.
如果存在表间联系的话，先删除此表间联系
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
D.
全面考虑上述3项
【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...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
