单项选择题
A.appletviewer B.java C.javac D.以上所有选项都不正确
A.North或South B.East或West C.Center D.North,South或Center
A.Threadable B.Runnable C.Clonable D.以上均不是
A.FlowLayout B.GridLayout C.BorderLayout D.CardLayout E.GridBagLayout
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