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多选题
Which statements concerning the relationships between the following classes are true？（） class Foo { int num； Baz comp = new Baz（）； } class Bar { boolean flag； } class Baz extends Foo { Bar thing = new Bar（）； double limit； }
A
A Bar is a Baz.
B
A Foo has a Bar.
C
A Baz is a Foo.
D
A Foo is a Baz.
E
A Baz has a Bar.
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