由于哑指标只是表明求和，所以它使用什么符号是无关重要的。

Since a dummy index just indicates summation, it is immaterial which symbol is used.

youdao

由于哑指标只是表明求和，所以它使用什么符号是无关重要的。

Since a dummy index just indicates summation, it is immaterial which symbol is used.

youdao