多项选择题
Which two are true？（）
A.The output is mm. B.The output is mc. C.Component is-a Meter. D.Component has-a Meter. E.DeluxeThingy is-a Component. F.DeluxeThingy has-a Component.
多项选择题 Which three are valid？（）
单项选择题 What is the result？（）
单项选择题 Given two files， GrizzlyBear.java and Salmon.java： If both classes are in the correct directories for their packages， and the Mammal class correctly defines the findSalmon（） method， which change allows this code to compile？（）
