单项选择题
A.X==Y B.AT(X,Y)=0 C.X=Y D.X$Y
A.0<=x<100 B.0<=x OR x<100 C.X>=0 AND x<100 D.0≤x<100
A.zap B.delete C.pack D.release
A.{″99/12/31″} B.ctod（99/12/31） C.{99/12/31} D.99/12/31
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