题目：
用于定义类成员的访问控制权限的一组关键字是
A． extends 和 implements
B． public，private 和 protected
C． class和public
D． char，int，float和double
答案：
参考答案：B
解析：修饰符分为访问限制符和非访问限制符。其中访问限制符有pub-lic．orivate．protected和default。非访问限制符有static，final和abstract等。
用于定义类成员的访问控制权限的一组关键字是A． extends 和 implemen
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