在下列情况下的菜刀：①切青菜后用清水冲洗 ②切湿咸菜后未清洗 ③切肥猪肉后放置，其腐蚀速率由快到慢的顺序是
——During the APEC summit（峰会)，Beijing's sky was so blue and clear.——It APEC blue.But too bad it no longer stays that way．
