单项选择题
Scala中如何定义常量（）。
A.var a = 1
B.val a = 1
C.public final int a = 1
D.private static final int a = 1
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单项选择题
A.var a = 1
B.val a = 1
C.public final int a = 1
D.private static final int a = 1
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