多項(xiàng)選擇題

Which two classes use the Shape class correctly？（）

A.A
B.B
C.C
D.D
E.E
F.F

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單項(xiàng)選擇題

What is the result？（）

A.1
B.12
C.14
D.123
E.Compilation fails.
F.An exception is thrown at runtime.

單項(xiàng)選擇題

What is the result？（）

A.Compilation fails.
B.Cannot add Toppings
C.The code runs with no output.
D.A NullPointerException is thrown in Line 14.

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