如果某一列数据不全,而且该列允许为空,则系统自动用()填入。
A.NULL
B.DELETE
C.SHIFT
D.OFF
参考答案:A
根据所给汉语和首字母提示完成句子
1. Ann t_________(与……相像) her sister, so people often make mistakes.
2. Jim is s __________ (相像的) to his brother.
3. Extra paper will be h__________ (分发) to the students who need it during the examination.
4. The s ________(策略) that he came up with worked out well.
5. There are many w _________ (站点) on the Internet.
急性蜂窝织炎与丹毒的相同之处是()。
A.病变处皮肤颜色
B.是否寒战、发热
C.病变区域与周围界限
D.病变区是否化脓
E.是否需要床边隔离