单选题:以下关于空值(NULL值)叙述正确的是( )。 题目分类:VF 题目类型:单选题 查看权限:VIP 题目内容: 以下关于空值(NULL值)叙述正确的是( )。 A.空值等于空字符串 B.空值等同于数值0 C.空值表示字段或变量还没有确定的值 D.Visual FoxPro不支持空值 参考答案: 答案解析:
根据材料,回答问题。 How One Simple Movement Can Let Slip the Secrets 根据材料,回答问题。 How One Simple Movement Can Let Slip the Secrets of the MindBody lang 分类:VF 题型:单选题 查看答案
Radiocarbon ting techniques can be used to identify the age Radiocarbon ting techniques can be used to identify the age of the earth.A.Right 分类:VF 题型:单选题 查看答案
For urban areas this approach was wholly inadequate. For urban areas this approach was wholly inadequate.A.really B.basically C.funda 分类:VF 题型:单选题 查看答案
Professional ballet was first performed in _________. Professional ballet was first performed in _________.A.France B.Italy C.Russia D 分类:VF 题型:单选题 查看答案