在如下程序中，引发错误的语句是______ class Fred;class Barney{ Fred f;}class Fred{ Barney b;}
举一反三
- Fred is the second to hand in maths papers in our class, but believe it or not, [br][/br]he ____(success) passed the last exam、
- 通过 SQL，在 "Actor" 表中删除 "FirstName" 等于 "Fred" 的记录的描述正确的是（）。 A: DELETE FirstName='Fred' FROM Actor B: DELETE ROW FirstName='Fred' FROM Actor C: DELETE Actor WHERE FirstName = 'Fred' D: DELETE FROM Actor WHERE FirstName = 'Fred'
- 通过 SQL，您如何在 "Persons" 表中删除 "FirstName" 等于 "Fred" 的纪录？ A: DELETE FROM Persons WHERE FirstName = 'Fred' B: DELETE FirstName='Fred' FROM Persons C: DELETE ROW FirstName='Fred' FROM Persons
- 模糊逻辑中两个命题析取的真值是两个命题真值的最大值。语句“Fred幸福或John幸福”与“Fred不幸福或John不幸福”的真值是什么?
- Considerthefollowingdialogue:Fred:Onaver...Inthisexchange,Tedis