市場平均成本

我曾經在微博上提出過這樣一個問題:

請花幾秒鐘思考一下這個問題,心中有了答案再往下看。

~

~

~

~

~

~

You need to login to view the rest of the content. Please . Not a Member? Join Us

This site uses Akismet to reduce spam. Learn how your comment data is processed.