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【多选题】
以下叙述中正确的是( )。A.
在同一C程序文件中,不同函数中可以使用同名变量
B.
在main函数体内定义的变量是全局变量
C.
形参是局部变量,函数调用完成即失去意义
D.
若同一文件中全局变量和局部变量同名,则全局变量在局部变量作用范围内不起作用
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