你提到了一個關鍵點：絕對風險和相對風險的降低。就在於從哪個角度看問題。

來源: viewfinder 於 2015-04-14 12:58:59 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.