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【多选题】
下面对对象成员的正确描述是（ ）。A.
可以在构造函数的初始化列表中给出对象成员的初始化
B.
可以在构造函数的函数体中给出对象成员的初始化
C.
如果一个对象成员有无参构造函数，则可以省略对象成员的初始化语句
D.
若A类中有B类对象成员，则在创建A类对象时，先执行B类的构造函数，再执行A类的构造函数
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