参照完整性规则包括更新规则、【 】和【 】。
参考答案:删除规则
解析:在Visual FoxPro中,参照完整性规则包括更新规则、删除规则和插入规则3种。
在平面直角坐标系中有两点A(-2,2),B(3,2),C是坐标轴上的一点,若△ABC是等腰三角形,则满足条件的点C有( )
A.6个
B.8个
C.9个
D.10个
Confucius was a great and thinker. His thoughts still influence us.
A.educator
B.scientist
C.inventor
D.musician