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【单选题】
下列有关函数返回值类型与返回值表达式(return后的表达式)类型描述中,( )是错误的。
A.
函数返回值类型是在定义函数时确定，函数调用时不能改变
B.
函数返回值类型就是函数表达式类型
C.
函数返回值类型决定了返回表达式类型
D.
函数返回值表达式类型与函数返回值类型不同时，表达式类型应该转换成函数返回值类型
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